Multi-turn user requests:
user: I am at the gas station and ready to fill up my car with gasoline. I would appreciate it if you could manage filling 30 liters into my vehicle to ensure it's properly fueled for the journey ahead.
user: With the fuel tank now filled with some gas, let's proceed to start the car engine. I'd be grateful if you could initiate the engine in 'START' mode for me.
user: After starting the engine, there was a slight vibration while I was driving. Would you mind checking something to confirm everything's in good working order?
user: Sure, I'll check the tire pressure for you.

Tools involved: VehicleControlAPI
Expected function-call sequence: VehicleControlAPI.liter_to_gallon
VehicleControlAPI.fillFuelTank
VehicleControlAPI.startEngine
VehicleControlAPI.check_tire_pressure
TicketAPI.create_ticket