generate response: I need a train ticket going to london liverpool st leaving cambridge anytime after 08:15 on sunday, can you help me with that?. Intent: book_train. Slots: train-bookpeople=1, train-day=sunday, train-departure=cambridge, train-destination=london liverpool street, train-leaveat=08:15
Response: I have booked for you train TR9025 the total fee is 13.28 GBP payable at the station . Reference number is : HTSDZ9LL