U: I am looking for a cheap place to dine that serves belgian food.

S: I'm sorry, but there are no belgian restaurants in all of cambridge. Would you like a different type of cuisine?

U: Let's try Indian food, but it needs to be near the centre of town.

S: There are no Belgian restaurants in the center of the town.  Would you like to try another type of restaurant?

U: Is there a cheap Italian place in the centre instead?

S: Yes, I've got pizza hut city centre in that area.  Would you like to try it?

U: Do they serve heaping portions of food?
S: Yes, previous guests have been pleased with the good portion sizes. Would you like help in booking a table?