U: I'm looking for a cheap restaurant that serves world food?

S: Unfortunately there are now restaurants that meet those specifications. Would you like me to look for a different kind of food?

U: The restaurant should be in the north.

S: The only restaurants in the north serve Asian Oriental, Chinese, European, French, Indian or Italian food. Would you like to change to one of those?

U: Tell me about the Indian restaurants in the north then please?

S: There are two Indian restaurants, the nirala and royal spice. The royal spice is in the cheap range and the nirala is in the moderate price range.

U: Do they have a nice location?
S: Both are in good locations, but The Nirala is more central. Would you like me to reserve a table for you there?