generate response: I need it to leave after 09:15 from London Liverpool Street. Can you find me a train and book it for 1 person?. Intent: book_train. Slots: train-arriveby=18:00, train-bookpeople=1, train-day=thursday, train-departure=london liverpool street, train-leaveat=09:15
Response: TR0998 leaves at 09:39. I have booked it for you. Reference number: JW1DTLPN .