generate response: I am also looking for a train to go to Birmingham New Street and to leave after 21:30. Can you book me a train that leaves on Saturday?. Intent: find_train. Slots: train-day=saturday, train-departure=cambridge, train-destination=birmingham new street, train-leaveat=21:30
Response: TR5413 leaves Cambridge at 22:01 and costs 60.08 pounds. How many tickets do you need?