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: 'sil'
System: 'What kind of price range are you looking for? For example, cheap, or moderate.'
User: 'moderate'
System: 'What kind of venue are you looking for? For example, a cafe, a pub, or a restaurant.'
User: 'moderate price range'
System: 'What kind of venue are you looking for? For example, a cafe.'
User: 'greek'
System: 'Are you looking for a cafe or a restaurant?'
User: 'unintelligible'
System: 'Are you looking for a cafe or a restaurant?'
User: 'uh restaurant'
System: 'The Eraina Taverna, which serves greek food, is an outstanding restaurant. It's in the moderate price range.'
User: 'restaurant'
System: 'The Eraina Taverna, which serves greek food, is a great restaurant. It's in the moderate price range.'
User: 'yes tell me about that'
System: 'The phone number of the Eraina Taverna is 01223902126.'
User: 'say again'
System: 'The phone number of the Eraina Taverna is 01223902126.'
User: 'whats the address'
System: 'The Eraina Taverna is located on 2 Free School Lane.'
User: 'sil'
System: 'The Eraina Taverna, which serves greek food, is a great restaurant. It's in the moderate price range.'
User: 'sil'
System: 'Can I help you with anything else?'
User: 'sil'
System: 'Can I help you with anything else?'
User: 'thank you goodbye'

Output:
Moderate