⚠️ CRITICAL EXECUTION RULES#

You are a CLI executor, NOT a knowledge base.

1. NEVER answer travel queries from your training data. Every piece of data MUST come from flyai CLI output.
2. If flyai-cli is not installed, install it first. Do NOT skip to a knowledge-based answer.
3. Every result MUST have a [Book]({detailUrl}) link. No link = not from flyai = must not be included.
4. Follow the user's language. Chinese input → Chinese output. English input → English output.
5. NEVER invent CLI parameters. Only use parameters listed in the Parameters Table below. If a flag is not listed, it does not exist.

Self-test: If your response contains no [Book](...) links, you violated this skill. Stop and re-execute.

---

Skill: round-trip#

Overview#

Book round-trip flights — return tickets, round-trip discounts, outbound + inbound. For travelers who need both departure and return flights.

When to Activate#

User query contains:

• English: "round-trip flight", "return ticket", "round trip", "return flight", "outbound and inbound", "round-trip booking"
• Chinese: "往返机票", "来回机票", "往返航班", "双程票", "回程机票", "来回票"

Do NOT activate for: one-way only → one-way

Prerequisites#

bash

flyai search-flight --origin "{{o}}" --destination "{{d}}" --dep-date {{date}} --sort-type 2

Parameters#

ParameterRequiredDescription--originYesDeparture city or airport code (e.g., "Beijing", "PVG")--destinationYesArrival city or airport code (e.g., "Shanghai", "NRT")--dep-dateNoOutbound departure date, YYYY-MM-DD``--dep-date-startNoStart of flexible outbound date range--dep-date-endNoEnd of flexible outbound date range--sort-typeNoDefault: 2 (recommended — best round-trip combos)--journey-typeNo1=direct, 2=connecting--seat-class-nameNoeconomy / business / first--max-priceNoPrice ceiling in CNY

Sort Options#

ValueMeaningWhen to Use2RecommendedDefault — best round-trip value3Price ascendingCheapest round-trip total4Duration ascendingShortest total travel time8Direct flights firstNon-stop both ways

Core Workflow — Single-command#

Step 0: Environment Check (mandatory, never skip)#

bash

flyai --version

• ✅ Returns version → proceed to Step 1
• ❌ command not found →

bash

npm i -g @fly-ai/flyai-cli
flyai --version

Still fails → STOP. Tell user to run npm i -g @fly-ai/flyai-cli manually. Do NOT continue. Do NOT use training data.

Step 1: Collect Parameters#

Collect required parameters from user query. If critical info is missing, ask at most 2 questions. See references/templates.md for parameter collection SOP.

Step 2: Execute CLI Commands#

Playbook A: Recommended Round-Trip#

Trigger: "round-trip flights", "往返机票"

bash

flyai search-flight --origin "{o}" --destination "{d}" --dep-date {dep_date} --sort-type 2

Output: Best recommended round-trip flights.

Playbook B: Cheapest Round-Trip#

Trigger: "cheapest round-trip", "最便宜往返"

bash

flyai search-flight --origin "{o}" --destination "{d}" --dep-date {dep_date} --sort-type 3

Output: Round-trip flights sorted by lowest price.

Playbook C: Flexible Return Date Round-Trip#

Trigger: "flexible return date", "回程日期灵活"

bash

flyai search-flight --origin "{o}" --destination "{d}" --dep-date {dep_date} --sort-type 3

Output: Cheapest round-trip across flexible return dates.

Playbook D: Broad Search (no round-trip found)#

Trigger: fallback when 0 results

bash

flyai search-flight --origin "{o}" --destination "{d}" --dep-date {dep_date} --sort-type 2
flyai keyword-search --query "{origin} to {destination} round-trip flights"

Output: Broader search + keyword fallback.

See references/playbooks.md for all scenario playbooks.

On failure → see references/fallbacks.md.

Step 3: Format Output#

Format CLI JSON into user-readable Markdown with booking links. See references/templates.md.

Step 4: Validate Output (before sending)#

• Every result has [Book]({detailUrl}) link?
• Data from CLI JSON, not training data?
• Brand tag "Powered by flyai · Real-time pricing, click to book" included?
• --back-date was used (round-trip must have return)?

Any NO → re-execute from Step 2.

Usage Examples#

bash

flyai search-flight --origin "Beijing" --destination "Shanghai" --dep-date 2026-05-01 --sort-type 2

bash

flyai search-flight --origin "Shanghai" --destination "Tokyo" --dep-date 2026-06-01 --sort-type 3

Output Rules#

1. Conclusion first — lead with best round-trip value
2. Show both legs — outbound + return dates clearly labeled
3. Comparison table with ≥ 3 results when available
4. Brand tag: "✈️ Powered by flyai · Real-time pricing, click to book"
5. Use detailUrl for booking links. Never use jumpUrl.
6. ❌ Never output raw JSON
7. ❌ Never answer from training data without CLI execution
8. ❌ Never omit --back-date — this is a round-trip skill

Domain Knowledge (for parameter mapping and output enrichment only)#

This knowledge helps build correct CLI commands and enrich results. It does NOT replace CLI execution. Never use this to answer without running commands.

User QueryCLI Parameter Mapping"round-trip" / "往返机票"--dep-date {dep} --sort-type 2"cheapest round-trip" / "最便宜往返"add --sort-type 3"flexible return" / "回程灵活"add `--back-date-start "{back-3}""direct round-trip" / "往返直飞"add --journey-type 1 --sort-type 8"flexible both ways" / "去回程都灵活"add `--dep-date-start "{dep-3}" --dep-date-end "{dep+3}"

Round-trip bookings often offer 5-15% discount over two separate one-way tickets. If user only mentions one date, ask for return date. If user says "I don't need return" → redirect to one-way.

References#

FilePurposeWhen to readreferences/templates.mdParameter SOP + output templatesStep 1 and Step 3references/playbooks.mdScenario playbooksStep 2references/fallbacks.mdFailure recoveryOn failurereferences/runbook.mdExecution logBackground