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

User requests (one per turn):
user: I'm planning a road trip from Rivermist to Stonebrook and would love an estimate on how far this journey will take me.
user: Great, now that I know the distance, please check if my current fuel level can handle the journey or if I need a refill.
user: Ah, it looks like I might need some fuel. Could you go ahead and fill up the tank with 30 gallons of fuel so that I end with 40 gallons?
user: Let's get the vehicle ready by starting the engine, please make sure everything's in place.

Expected function call sequence:
VehicleControlAPI.get_zipcode_based_on_city
VehicleControlAPI.estimate_distance
VehicleControlAPI.estimate_drive_feasibility_by_mileage
VehicleControlAPI.fillFuelTank
VehicleControlAPI.startEngine