Definition: 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.
Input: 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: 'im looking for a texmex restaurant'
System: 'What kind of price range are you looking for? For example, cheap, or free.'
User: 'with expensive price range'
System: 'What kind of price range are you looking for? For example, cheap, free, or moderate.'
User: 'expensive'
System: 'There is no restaurant in the Girton area and serving mexican and tex mex food.'
User: 'i do not care about the area'
System: 'Would you like a girton area, or you don't care?'
User: 'i dont care'
System: 'Would you like a mexican and tex mex food, or you don't care?'
User: 'mexican or texmex'
System: 'What kind of price range are you looking for? For example, cheap, or moderate.'
User: 'expensive'
System: 'What kind of price range are you looking for? For example, expensive, or free.'
User: 'expensive'
System: 'Nanna Mexico is a great restaurant. It serves mexican and tex mex food. It's in the expensive price range.'
User: 'can you give me the address and price'
System: 'Nanna Mexico is located on 33 Regent Street.'
User: 'sil'
System: 'Nanna Mexico is an outstanding restaurant.'
User: 'can you give me the price range'
System: 'Nanna Mexico is a great venue. The price for main courses ranges from 5 pounds 35 to 15 pounds 50 and the price for a cappuccino is 2 pounds 95.'
User: 'thank you good bye'

Output:
Expensive