Multi-turn user requests:
user: List all international airports currently accessible for travel.
user: I'm based in Crescent Hollow. Determine which airport is closest to my location from the previously listed options.
user: I'm organizing a trip soon and need the flight cost from my nearest airport to Pinehaven on March 3, 2024, traveling in business class.

Involved API classes: MathAPI
TravelAPI

Initial environment state:
TravelAPI: credit_card_list: card9999: card_number: 1234-5678-9012-3456
cardholder_name: Evelyn Harper
expiry_date: 12/25
balance: 5000
booking_record: BR123456: flight_number: FL123
cost: 1200
access_token: abc123xyz
token_type: Bearer
token_expires_in: 3600
token_scope: read_write
user_first_name: Evelyn
user_last_name: Harper
budget_limit: 3000

Ground-truth function call path:
TravelAPI.list_all_airports
TravelAPI.get_nearest_airport_by_city
TravelAPI.get_flight_cost
MathAPI.mean

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