Q: The input is a conversation between an automated system and a user looking for suggestions for pubs, restaurants and coffee shops in Cambridge. In the dialogue, the user may provide some criteria for the type of place they want such as price range, cuisine, etc. Given such a dialogue, output the price range the user if looking for which can take one of four values: Cheap, Moderate, Expensive and Don't Care. Output cannot be any other value than the four values. Note that if the user asks for the prices of items provided at a pub, restaurant or coffee shop but doesn't mention the price range they are looking for then the correct classification will be Don't Care. If the user does not mention a particular price, the correct classification will be Don't Care.
System: 'Thank you for calling the Cambridge Information system. Your call will be recorded for research purposes. You may ask for information about a place to eat, such as a restaurant, a pub, or a cafe. How may I help you?'
User: 'sil'
System: 'What kind of venue are you looking for? For example, a cafe, or a restaurant.'
User: 'breathing sil'
System: 'What kind of price range are you looking for? For example, cheap, or expensive.'
User: 'hi'
System: 'What kind of price range are you looking for? For example, cheap, expensive, or moderate.'
User: 'hi i am looking for an'
System: 'What kind of price range are you looking for? For example, free, or moderate.'
User: 'hi i am looking for an ex'
System: 'What kind of price range are you looking for? For example, expensive, free, or moderate.'
User: 'im looking for an expensive restaurant'
System: 'Caffe Nero is a great cafe and it's in the expensive price range.'
User: 'hi im looking for an expensive restaurant'
System: 'Caffe Nero is an outstanding venue. The price for main courses ranges from 3 pounds 50 to 3 pounds 85 and the price for a cappuccino is 2 pounds 15.'
User: 'sil'
System: 'What type of food would you like? For example, Mexican and Tex Mex, Greek, or International.'
User: 'im looking for an expensive restaurant'
System: 'What type of food would you like? For example, Fusion, Middleeastern, or Thai.'
User: 'thia food'
System: 'Are you looking for somewhere near a particular venue? For example, Byard Art, the Museum Of Technology, or the Ruskin Gallery.'
User: 'sil'
System: 'Are you looking for somewhere near a particular venue? For example, Castle Galleries, Christ's College, or Kettle's Yard.'
User: 'some where at trumpington area'
System: 'The phone number of Caffe Nero is 01223307728.'
User: 'is it in trumpington area'
System: 'Caffe Nero is a great cafe.'
User: 'is it in the trumington area'
System: 'Caffe Nero is a great cafe.'
User: 'whats the address please'
System: 'Caffe Nero is on 11 Market Street.'
User: 'which area'
System: 'I am sorry but there is no information on Caffe Nero's area.'
User: 'ok thank you good bye'

A:
Expensive