generate response: I need 4 tickets, and the price and train ID. Intent: book_train. Slots: train-arriveby=16:30, train-bookpeople=4, train-day=friday, train-departure=cambridge, train-destination=london liverpool street
Response: I booked 4 tickets on train TR4187, your reference number is LXZWA3Q8 . A total of 66.4 GBP is payable at the station, can I help you with anything else?