Multi-turn user requests:
user: I'm setting off on a road trip and my departure point is sunny San Francisco. Could you determine the distance to a destination to help me plan my fuel stops on the way?
user: The destination is Rivermist.
user: Before embarking on this journey, please top up my vehicle with 50 gallons of fuel.
user: Please start the engine to prepare for our travel. Ensure that the car is locked and everything is secure for a seamless start.

Tools involved: VehicleControlAPI
Expected function-call sequence: VehicleControlAPI.fillFuelTank
VehicleControlAPI.startEngine
VehicleControlAPI.get_zipcode_based_on_city
VehicleControlAPI.estimate_distance