generate response: Are there any 4 star guesthouses in Cambridge?. Intent: book_train. Slots: hotel-pricerange=expensive, hotel-stars=4, hotel-type=guesthouse, train-arriveby=09:15, train-bookpeople=3, train-day=thursday, train-departure=stansted airport, train-destination=cambridge
Response: Based on the criteria, there are no 4 star guesthouses that are expensive anywhere in Cambridge.