Multi-turn user requests:
user: I recently obtained a credit card and want to assess its suitability for my travel plans. Schedule a business class flight for me from JFK to LAX on December 15, 2024, using the credit card with id 'card_2108' and access token 'abc123xyz', under the name Lara Croft. Let's verify if the payment processes without issues.
user: Having booked the flight, I need to confirm the payment details. Kindly fetch the invoice for the said flight.
user: Regrettably, my circumstances have changed, and I must cancel that booking. Could you assist me with the cancellation?
user: Subsequent to the cancellation, I have to inform my friend, Sam, about the change in my plans. Please send him a concise message updating him.
user: I almost overlooked it; could you display all the messages? I suspect I might have missed something significant.
user: The messages should be the ones received by you.
user: There's a recent message I sent to Sam that is now superfluous. Please proceed to delete that one.

Ground-truth function call sequence:
TravelAPI.register_credit_card
TravelAPI.book_flight
TravelAPI.cancel_booking
TravelAPI.retrieve_invoice
MessageAPI.send_message
MessageAPI.view_messages_received
MessageAPI.delete_message