Multi-turn user requests:
user: I'm on a quest to escape my quaint hometown of Oakendale for the dynamic allure of Los Angeles! Eagerly anticipating this journey, I need to arrange a flight on the 15th of next month, which is November of 2024. I’ll be using my reliable credit card represented by 'crd6789' and token 'abc123xyz', to reserve a seat in business class. Could someone handle these travel arrangements for me, please?
user: With the excitement of my flight secured, I'd feel more at ease by getting travel insurance for $50 under the 'comprehensive protection' plan. How about using the same credit card and token for this? And, hopefully, we can link it to the flight booking?
user: My notorious forgetfulness strikes again! I cannot recall all the specifics about the flight and insurance I just organized. Would be great if someone could retrieve the invoice from my latest transaction to ensure everything is lined up properly.
user: An unexpected charge popped up on the invoice that I retrieved. If at all possible, could someone contact customer support with the details to hopefully solve this issue with the message 'Unexpected charge found on the invoice.'?
user: Customer support didn't quite resolve my concerns, and now I'm a bit frustrated. It would be appreciated if a priority-2 ticket titled 'Billing Concern' could be initiated, incorporating the detailed exchange with customer support, so we can escalate this appropriately. Details be 'Detailed exchange with customer support regarding unexpected charge.'

Ground-truth function call sequence:
TravelAPI.list_all_airports
TravelAPI.get_nearest_airport_by_city
TravelAPI.book_flight
TravelAPI.purchase_insurance
TravelAPI.retrieve_invoice
TravelAPI.contact_customer_support
TicketAPI.create_ticket