Answer: "I will be very happy and successful in the future."
Explanation: When he went to his future self. He saw that he was a very successful businessman. But he has to work hard to achieve the future that he saw. when he came back, he called his parents who are always worried about their son's future to tell them his future. when he told them his future he said "mom, dad you don't have to worry about me. I will be very happy and successful in the future. After I saw my future I myself want to work hard and achieve the future I saw." after listening to what he is saying, they couldn't be happier and his mother said "now you have told us this but we want to see you being successful. So you have to promise us that you will let everyone see the future that you saw today".