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.
Q: 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 an expensive restaurant in the fen ditton area'
System: 'The Riverside Restaurant, which is in the Fen Ditton part of town, is a great restaurant. It's in the expensive price range.'
User: 'what type of food do they have'
System: 'The Riverside Restaurant serves contemporary food.'
User: 'whats the phone number'
System: 'The phone number of the Riverside Restaurant is 01223418997.'
User: 'what is the address'
System: 'The Riverside Restaurant is on Cambridge Regional College, Newmarket Road.'
User: 'thank you goodbye'

A: 
Expensive