A computer system can communicate with a mobile device of a service provider to receive location data. Additionally, the computer system can monitor, from the location data, a location of the mobile device over a duration that follows the service provider being assigned to a service request. Based on monitoring the location data, the computer system can determine whether the service provider has failed to correctly indicate when a transport service for the service request began. Moreover, the computer system can cause a service application running on the mobile device to prompt the service provider to enter input to identify a start location where the transport service began, in response to the computer system determining that the service provider has not correctly indicated when the transport service begun.