generate response: I will departing from Cambridge and arriving in Stansted Airport. I need to find a train for Monday for 7 people to leave after 8:30 am.. Intent: book_train. Slots: train-bookpeople=7, train-day=monday, train-departure=cambridge, train-destination=stansted airport, train-leaveat=08:30
Response: There is no train available on Monday for this time. Would you like to change your departure time?