generate response: just me, leave at 19:45. please tell me the arrival time and travel time. Intent: book_train. Slots: train-bookpeople=1, train-day=saturday, train-departure=cambridge, train-destination=kings lynn, train-leaveat=19:45
Response: You can depart at 19:11, arriving at 19:58, or at 20:11, arriving at 20:58. Travel time is 47 minutes.