generate response: I'm so sorry. I didn't mean to book yet. I won't need that reservation. Could you make sure that train TR3390 is departing from London Liverpool?. Intent: book_train. Slots: train-arriveby=08:45, 8:45, train-bookpeople=1, train-day=saturday, train-departure=peterborough, train-destination=cambridge
Response: Train TR3390 is departing from peterborough to cambridge. Would you like me to look for a train departing from London Liverpool?