Multi-turn user requests:
user: Calculate the exchange rate for 1500 USD to EUR for me, I have some funds to convert quickly.
user: Now that I have the converted amount, orchestrate the reservation of a flight this weekend from San Francisco to Boston in the business class category, utilizing my access token, and ensure it is billed to my primary credit card.
user: The flight cost is $2345, the date is July 1st, 2024, and the access token is 'abc123xyz456'. The credit card id is 'card5638'.
user: Once the flight arrangement has been secured, retrieve the invoice particulars so I can log them for my budgetary purposes.
user: To resolve some complications I encountered during my booking, kindly reach out to customer support and convey that I require assistance with the transaction particulars.
user: Upon reaching out to customer support, dispatch a concise message through my account with id 'USR100145' to my advisor 'travel_advisor', conveying the specifics of the problems I faced. They are anticipating this communication promptly.

Ground-truth function call sequence:
TravelAPI.compute_exchange_rate
TravelAPI.get_flight_cost
TravelAPI.book_flight
TravelAPI.retrieve_invoice
TravelAPI.contact_customer_support
MessageAPI.send_message