generate response: i am also looking for a train. The train should leave after 20:15 and should depart from london liverpool street.. Intent: find_train. Slots: train-departure=london liverpool street, train-leaveat=20:15
Response: There are trains every day at 21:39 and 23:39 that run from London Liverpool Street to Cambridge. Do you know what day you'll be travelling? Would you like to book tickets?