U: I am looking for an expensive place to dine that serves catalan food.

S: I do not show any matches for your request, maybe change the type of food?

U: Are you sure?  I really need an expensive restaurant that serves catalan food in the centre of the city.  Can you check again please?

S: I am sure, would you like me to check for another option?

U: Could you recommend a restaurant that serves indian food is expensive, and in the centre?

S: I am sorry there are not Indian restaurants. Can I check for a Chinese restaurant?

U: There are no restaurants that serve indian food?

S: I am afraid there is none.

U: What type of restaurants are located in the city centre?

S: I'm so sorry, I was mistaken, there are several expensive Indian restaurants in the centre of town.  May I recommend Curry Queen, at 106 Mill Road?

U: Can you see if they offer high quality Samosas?
S: Customers all rave about the food available at the Curry Garden saying that it's awesome and full of flavor.