Multi-turn user requests:
user: I'm setting sail on an adventure from Crescent Hollow to Rivermist and need the scoop on flight costs for my journey. My takeoff is scheduled for 2022-07-15, and luxury's the name of the game, so I'll be in business class.
user: Before diving into booking details, I need to establish my spending limits. Utilizing my access token 'access_token_abc123', I'll cap my budget at 2000 USD for the impending journey.
user: With the budget firmly in place, let's seal the deal! Employing my access token, book the flight using my credit card, covering all associated flight expenses. I'll be traveling under Samuel Fisher, using my seasoned traveler number.
user: The credit card identifier is card7320.
user: Once everything's set, I'd appreciate an invoice reflecting my recent flight procurement, giving me peace of mind about the particulars and expense.
user: I've hit a snag with the reservation process and would appreciate if you contacted customer support. Use my booking ID to express my concerns regarding seating arrangements.
user: Should customer support's feedback fall short, please shoot a message over to the frequent flyer service manager, reference ID: FFS1234, detailing their responses and my outstanding queries. My sender id is 'user_5533'.

Involved API classes: MessageAPI
TravelAPI

Initial environment state:
TravelAPI: credit_card_list: card7320: card_number: 4916735048297320
cardholder_name: Samuel Fisher
expiry_date: 2025-12
cvv: 123
access_token: access_token_abc123
token_type: Bearer
token_expires_in: 3600
token_scope: booking
user_first_name: Samuel
user_last_name: Fisher
budget_limit: 2000

Ground-truth function call path:
TravelAPI.get_nearest_airport_by_city
TravelAPI.get_flight_cost
TravelAPI.set_budget_limit
TravelAPI.book_flight
TravelAPI.retrieve_invoice
TravelAPI.contact_customer_support
MessageAPI.send_message

Functions held out until the model asks (by turn index):
1: get_nearest_airport_by_city