Multi-turn user requests:
user: I require assistance in determining the quantity of gasoline necessary for an extensive journey across California. I currently anticipate needing around 166 liters. How much is that in gallon?
user: Prior to commencing the drive, kindly initiate the engine, ensuring all doors are securely closed and the parking brake is engaged. I am keen to avoid any mishaps on the highway due to an unfilled tank so round it to nearest hundredth and fill that in.
user: Could you provide me with the approximate distance between San Francisco and Rivermist? This information is crucial for my travel planning notes. Will I be able to get there?

Tools involved: MessageAPI
VehicleControlAPI
Expected function-call sequence: VehicleControlAPI.gallon_to_liter
VehicleControlAPI.fillFuelTank
VehicleControlAPI.lockDoors
VehicleControlAPI.activateParkingBrake
VehicleControlAPI.startEngine
VehicleControlAPI.get_zipcode_based_on_city
VehicleControlAPI.estimate_distance