generate response: Yes please book whichever one is earliest and make sure to get 2 tickets. Then give me the reference number. Intent: book_train. Slots: train-arriveby=09:00, 9:00, train-bookpeople=2, train-day=tuesday, train-departure=cambridge, train-destination=london liverpool street
Response: Your booking went through for the 05:59 train. Your reference number is D0FUB4UC, and that is payable at the station. Is there anything else I can assist you with?