generate response: I am leaving from London Liverpool Street on Wednesday please.. Intent: find_train. Slots: train-arriveby=14:45, 2:45 pm, train-day=wednesday, train-departure=london liverpool street, train-destination=cambridge
Response: Trains leave London Liverpool Street every 2 hours beginning at 5:39. The latest leaves at 11:39 and arrives in Cambridge at 13:07.