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: 'looking for an expensive restaurants'
System: 'What part of town do you have in mind? For example, something in the Addenbrooke's, Barnwell, or Girton area.'
User: 'addenbrookes area'
System: 'The Lucky Star, which is in the Addenbrooke's part of town, is a great restaurant. It's in the expensive price range.'
User: 'address'
System: 'The Lucky Star is on Unit.'
User: 'phone number and post code'
System: 'The phone number of the Lucky Star is 01223244277 and it's in the area with the postcode CB1 7DY.'
User: 'unintelligible'
System: 'There is no restaurant in the Addenbrooke's area and serving fusion food.'
User: 'what is the address'
System: 'The Lucky Star is on Unit.'
User: 'what is the address'
System: 'The Lucky Star is on Unit.'
User: 'thank you goodbye'

Output:
Expensive