Multi-turn user requests:
user: Check the verification of Eleanor Smith's personal details, including her date of birth, March 15, 1985, and her passport number US123456789.
user: Identify the closest airport to Crescent Hollow.
user: Arrange a flight reservation to the nearest airport in Hong Kong, with the departure date set for December 15, 2024, in economy class at a cost of $850, using the credit card labeled 'primary' and access token 'abc123xyz' on file, ensuring all personal information is verified and protected. Make sure the budget limit is 1000.
user: Locate and provide the travel invoice that has gone missing for review of the transaction details.
user: Contact customer support urgently to report and resolve a discrepancy encountered with the booking, providing all necessary details.

Tools involved: TicketAPI
TravelAPI
Expected function-call sequence: TravelAPI.verify_traveler_information
TravelAPI.get_nearest_airport_by_city
TravelAPI.book_flight
TravelAPI.retrieve_invoice
TravelAPI.contact_customer_support
TravelAPI.cancel_booking
TicketAPI.create_ticket