Find the cheapest one-way flight across two departure cities with ChatGPT agent

Our rewrite with extra checks. The poster didn't test it.

Goal: Find the cheapest one-way flight from Ljubljana or Zagreb to Bordeaux between [DATE RANGE].

Inputs (fill in or confirm):
- Departure airports (Ljubljana, Zagreb, others nearby?)
- Date range
- Bags and travellers
- Latest arrival time I'd accept

Rules:
- Search both departure cities for every date.
- Include bag fees and self-transfer risks.
- Compare at least two sources.
- List the 3 cheapest with times.
- Include nearby airports only if I allow them, and add ground-transfer time and cost.
- Note fare rules for bags and changes.
- Report the cheapest per day so I can see price patterns.
- Check both airports on the same dates and compare in one table.
- Show ground transport cost to each departure airport.
- Give a booking link for the cheapest option.
- Note the airline's change and refund rules for the cheapest fare.

Checkpoint: Don't book.

If you get stuck: If a site blocks you, switch source and note it. If a login, CAPTCHA or two-step code appears, stop and ask me to handle it; never guess or store passwords.

Verify before you finish: Recheck the cheapest price on the booking page.

Output: Table of cheapest options.

Done when: I know the cheapest fare and its trade-offs.