⚠️ 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

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

Parameters

Sort Options

Core Workflow — Single-command

Step 0: Environment Check (mandatory, never skip)

flyai --version

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

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"

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"

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"

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

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

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

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.

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