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

User requests (one per turn):
user: I've just secured all doors and engaged the parking brake in my vehicle, please start the engine with the ignition on START mode.
user: What is the postal code for the area called Rivermist?
user: I would like to determine the distance from Rivermist to San Francisco.
user: Please relay the estimated distance from Rivermist to San Francisco to my colleague Emma. If it helps, my id is 'USR005'. The message should be in the format 'The estimated distance from Rivermist to San Francisco is X miles.', where X is replaced by the actual integer value you computed earlier.
user: Since we’ve organized those details, display all the messages we have send.

Expected function call sequence:
VehicleControlAPI.startEngine
VehicleControlAPI.get_zipcode_based_on_city
VehicleControlAPI.estimate_distance
MessageAPI.send_message
MessageAPI.view_messages_received
MessageAPI.delete_message