generate response: I'd just like to leave after 15:30, not really concerned with arrival time.. Intent: find_train. Slots: train-arriveby=dontcare, train-day=monday, train-departure=leicester, train-destination=cambridge, train-leaveat=15:30
Response: TR2985 leaves leicester at 16:09 and arrives in cambridge at 17:54. Would you like help booking tickets for this train or another one?