generate response: I don't have a preferred arrival time. Could you just book me one for 13:40?. Intent: book_train. Slots: train-arriveby=dontcare, train-bookpeople=1, train-day=tuesday, train-departure=birmingham new street, train-destination=cambridge, train-leaveat=11:15
Response: Will that be 1 ticket on the 13:40 train from birmingham new street to cambridge, then?