A dispatch database maintains, for a plurality of vehicles available for dispatch, vehicle data and constraints data. A processor is programmed to execute a dispatch server to perform operations including to receive a dispatch request requesting a vehicle to arrive at a request location, utilize a machine-learning model to identify one or more of the plurality of vehicles to respond to the dispatch request, the machine-learning model utilizing the vehicle data and the constraints data as inputs to determine the one or more of the plurality of vehicles, and inform the one or more of the plurality of vehicles of the dispatch request.