Multi-turn tool-use scenario.
Tools involved: TravelAPI

User requests (one per turn):
user: As I'm in the process of planning an upcoming journey, I have specific departure and arrival cities in mind. Could you assist in estimating the airfare between ORD and SVP from the comprehensive list available through the system? Please note, I am considering traveling next weekend July 14th, 2024 with a preference for a business class seat.
user: In pursuit of a cost-effective travel experience, I seek your guidance to manage my expenditure effectively. Could you help establish a budget limit of 20,000 USD using my currently active account?
user: The access token is 'abc123xyz456'.

Expected function call sequence:
TravelAPI.list_all_airports
TravelAPI.get_flight_cost
TravelAPI.compute_exchange_rate
TravelAPI.set_budget_limit