A robot including an input interface configured to receive a service identifier in response to a service request; a camera configured to capture a video of a user who has presented the service identifier; a transceiver configured to receive service information associated with the service identifier; and a processor configured to identify the user who has presented the service identifier from the video using an artificial neural network based learning model; and in response to successfully identifying the user, perform a task corresponding to the service request for the user based on the service information.