generate response: Yes, I need tickets for 4 people, and can you give me a reference number?. Intent: book_train. Slots: train-arriveby=14:30, 2:30 pm, train-bookpeople=4, train-day=friday, train-departure=bishops stortford, train-destination=cambridge
Response: We have it booked for 4 tickets. Your reference number is B5DD4PQW . The total fee is 40.40 GBP.