Multi-turn user requests:
user: I plan to book a flight from Crescent Hollow to New York, aimed at a business endeavor. Utilize my typical credit card and access token for the payment. Schedule it for economy class on November 12th 2024, making sure my frequent flyer discount is applied, ensuring the total fee is $850.
user: The credit card ID is card_6789 and the access token is 'abc123xyz'.
user: Post-booking, pondering added precautions, getting travel insurance seems wise, aiming for a coverage sum of $100,000 costing half of its coverage. Proceed with organizing this with identical travel specifics, and the previously mentioned credit card should facilitate payment.
user: For clarity on financial allocations, I need to gather the invoice that details my recently acquired flight and insurance.
user: Given sudden itinerary conflicts, there's a pivot. Inform customer support of my potential adjustments or explore full refund possibilities because of a family emergency.

Involved API classes: TravelAPI

Initial environment state:
TravelAPI: credit_card_list: card_6789: card_number: 4938 5639 9827 6789
cardholder_name: Ethan Hawke
expiry_date: 12/25
cvv: 123
access_token: abc123xyz
token_type: Bearer
token_expires_in: 3600
token_scope: read write
user_first_name: Ethan
user_last_name: Hawke
budget_limit: 2000

Ground-truth function call path:
TravelAPI.get_nearest_airport_by_city
TravelAPI.book_flight
TravelAPI.purchase_insurance
TravelAPI.retrieve_invoice
TravelAPI.contact_customer_support
TravelAPI.cancel_booking

Functions held out until the model asks (by turn index):
4: retrieve_invoice