generate response: I'm actually interested the saffron brasserie and I'd like to book it for one on Saturday @ 15:00 . May I have the reference number?. Intent: book_restaurant. Slots: restaurant-bookday=saturday, restaurant-bookpeople=1, restaurant-booktime=15:00, restaurant-name=saffron brasserie
Response: Unfortunately I am unable to book that for you. Is there a different option.