U: I am  looking for information in Cambridge.  looking for a restaurant.

S: Sure, what kind of restaurant?

U: It doesn't matter but it should be expensive and it should be in the centre.

S: Do you have any cuisine preferences?

U: Yes, we would like American type food.

S: We actually have different categories of american food -- latin american, modern american, north american, and "the americas." Which of these would you prefer?

U: How about latin america?

S: I'm sorry. I have no results that meet your criteria. Would you like to try a different food type, price range, or area?

U: How about North American cuisine instead?

S: Gourmet Burger Kitchen is expensive and in the center.  Would you like to book a table?

U: Yes please, for Thursday, 7 people at 16:45. I also need a reference number.

S: Booking was successful. The table will be reserved for 15 minutes. Reference number is : 2FX5XCUM. is there anything else i could help you with?

U: Do they have outdoor seating?
S: Yes, the Gourmet Burger Kitchen does offer its customers an excellent outdoor seating area at its location.