Multi-turn user requests:
user: I'm planning a business class trip from JFK in New York to LAX in Los Angeles on December 15, 2024. Alex Johnson will be my traveling companion. I intend to use my credit card to cover the $4500 trip cost. I've got my access token here. Once booked, I'll need to cancel the trip immediately due to unexpected changes in my schedule.
user: The credit card label is 'id_1234' and the access token is ABCD1234.
user: Additionally, I must file a priority 5 support ticket concerning the flight cancellation, labeled 'Urgent Flight Cancellation'. The ticket should thoroughly explain the abrupt changes leading to the cancellation. It's vital that this ticket is addressed promptly and closed once everything is sorted out.

Ground-truth function call sequence:
TravelAPI.register_credit_card
TravelAPI.book_flight
TravelAPI.cancel_booking
TicketAPI.create_ticket
TicketAPI.close_ticket