inform((_:search,area,'north');(_:search,pricerange,'cheap');(_:search,type,'Restaurant'))
user
I want to find a cheap restaurant in the north part of town .
request((_:search,food,?);(_:search,type,'Restaurant'))
system
What food type are you looking for ?
inform((_:search,food,'dontcare');(_:search,type,'Restaurant'))
user
Any type of restaurant will be fine .
system
Da vinci pizzeria is located in the north part of town and in the cheap price range .
_:search area north
_:search pricerange cheap
_:search type Restaurant
_:search area north
_:search pricerange cheap
_:search food dontcare
_:search type Restaurant