generate response: It doesn't matter when I leave, as long as I arrive by 12:45.. Intent: book_train. Slots: train-arriveby=12:45, train-bookpeople=3, train-day=saturday, train-departure=peterborough, train-destination=cambridge, train-leaveat=dontcare
Response: TR5538 leaves at 11:48 and will arrive by 12:38. Would you like for me to book this train for you?