Abstract: The present invention provides a self-service system (100) comprises: at least one mobile robot (110) for providing the services; and a cloud server (140) in communication with the at least one mobile robot (110) and a plurality of user mobile devices (180) via a communication network, characterised in that the cloud server (140) comprises: a queue management module (141) configured to generate a digital queue number to a designated user mobile device (180) upon receiving a request; and a robot management system (142) configured to manage activities of the mobile robot (110) in accordance to the sequence of the generated digital queue numbers, wherein the system (100) further comprises a means to guide the mobile robot (110) to the designated position of the user mobile device (180).