Mishraji... Majestic and Kempegowda both are same. Once you get down from the train, take the main exit (PF1 exit) and walk towards the subway. The other end of Subway will lead to Majestic Bus stand (Kempegowda Bus stand). Airport bound Volvo buses will be stationed in the median road (b/n city service and long route service). You can ask and hop on to the same.