Detailed Instructions: 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.
Problem: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.'
User: 'italian restaurant'
System: 'Are you looking for somewhere near a particular venue? For example, Castle Galleries, the Ruskin Gallery, or the Saint Barnabas Press Gallery.'
User: 'no'
System: 'Caffe Uno, which serves italian food, is an outstanding restaurant.'
User: 'is it expensive'
System: 'No. Caffe Uno is in the moderate price range.'
User: 'sil'
System: 'Clowns, which serves italian food, is an outstanding cafe and a great restaurant. It's in the cheap price range.'
User: 'im looking for an expensive italian restaurant'
System: 'Clowns, which serves italian food, is an outstanding cafe. This place, which is a great restaurant, is in the cheap price range.'
User: 'im looking for an expensive italian restaurant'
System: 'The Sorrento, which serves italian food, is an outstanding restaurant. It's in the expensive price range.'
User: 'background noise'
System: 'Would you like a venue with a cheap or expensive price range?'
User: 'expensive'
System: 'The Sorrento, which serves italian food, is a great restaurant. It's in the expensive price range.'
User: 'sil'
System: 'The Sorrento is an outstanding restaurant.'
User: 'what is the phone number'
System: 'The phone number of The Sorrento is 01223243533. The price for main courses ranges from 9 pounds to 16 pounds 95.'
User: 'what is the phone number'
System: 'The phone number of The Sorrento is 01223243533.'
User: 'thank you good bye'

Solution:
Expensive