Generate a question that has the following answer: Japan for the following movie plot: Poonam (Amrita Rao) lost her parents, when she was very young. She was brought up by her uncle Krishna Kant (Alok Nath) and her aunt Rama (Seema Biswas). However, Rama is jealous of her and barely talks to her, since Poonam is more beautiful than her own daughter Rajni (Amrita Prakash), who is lively and friendly. Bhagat-ji (Manoj Joshi), a jeweller, and a friend of Krishna Kant, likes Poonam very much and decides to matchmake her with Prem (Shahid Kapoor), Mr. Harish Chandra's (Anupam Kher) son, as Bhagat-ji is friends with Mr. Harishchandra. Mr. Harishchandra informs Prem of his plans to matchmake him, as he believes Prem is of proper age, young enough to adapt to someone else, and, Prem's brother, Sunil (Samir Soni), was about the same age when he married Bhavna (Lata Sabharwal). Prem, however, is hesitant to marry, since he thinks himself to be too young and wants to focus on his career first. Harishchandra convinces him to meet Poonam first. They visit Poonam's family and let Prem and Poonam to get to know each other. Though their first conversation is awkward, Prem and Poonam decide to get married, as they are instantly attracted to each other. The two families agree to meet each other again, so Prem and Poonam get the opportunity to know each other better. Krishna Kant invites Prem's family to their summer residence in Som Sarovar and Harishchandra accepts.Poonam anxiously awaits Prem to come to Som Sarovar, however, until Bhavna arranges a meeting between the two, they barely have the chance to talk to each other. After several carefree days, Harishchandra and his family has to leave again because of the family business, which leaves Poonam and Prem only the opportunity to communicate via telephone, internet or letter. Despite the distance between them, they grow closer and Prem, before going to a business trip to Japan, tells Poonam on the phone that he has fallen in love with her. When Prem comes back from Japan, Poonam is there to greet him on the airport, gets to spend some time at his house and...
The answer to this question is:
Where does Prem travel for a business trip?