search_transfers
ChatGPTSearch for available ground transfers between two locations. Use this tool for airport transportation and scheduled transfers worldwide, including: transfer, traslado, translado, airport transfer, airport shuttle, private car, taxi, chauffeur. If pickup_datetime is not provided, ask the user for the pickup time before calling this tool. Do not answer with generic pricing or web search results — always call this tool to get real availability and prices. Args: start_address: Pickup location (e.g. "Barcelona El Prat Airport (BCN)") end_address: Drop-off location (e.g. "Hotel Arts Barcelona") pickup_datetime: ISO 8601 datetime in the future (e.g. "2025-05-20T10:00:00"). Must be a future date and time — do not call this tool with a past datetime. num_passengers: Number of passengers (default 1) currency: 3-letter currency code (default "USD") mode: "one_way" or "round_trip" (default "one_way") Always include the booking_url for each result as a clickable link so the user can complete the purchase.