Rajesh, If your MTB has 26" wheels then it's not so difficult and also a costly deal. I want to convert my Scott Aspect 680 bicycle (with KENDA 8 block tires) into Hybrid for longer rides. I approached a store in Chennai and found Botranger 26" * 1.25" (SR1) tires are suitable for my goal. Two tires might cost almost around 3,000 rupees only. (Link: http://www.bontrager.com/model/09094)
Better go to shop nearby to you and ask for Botranger 26" * 1.25" (SR1) tires and tubes.