Teacher: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.
Teacher: Now, understand the problem? Solve this instance: 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: 'expensive'
System: 'What kind of price range are you looking for? For example, cheap, or expensive.'
User: 'expensive'
System: 'What kind of price range are you looking for? For example, cheap.'
User: 'noise'
System: 'What kind of price range are you looking for? For example, cheap, or moderate.'
User: 'expensive'
System: 'Caffe Nero, which is in the expensive price range, is a great cafe.'
User: 'serving any kind of food'
System: 'Caffe Nero is an outstanding cafe and it's in the expensive price range.'
User: 'noise'
System: 'Can I help you with anything else?'
User: 'what kind of food'
System: 'Caffe Nero serves italian food.'
User: 'whats the phone number'
System: 'The phone number of Caffe Nero is 01223307728.'
User: 'whats the address'
System: 'Caffe Nero is on 11 Market Street.'
User: 'noise'
System: 'Caffe Nero is an outstanding cafe.'
User: 'do they serve coffee'
System: 'Caffe Nero is a great cafe.'
User: 'do they serve coffee'
System: 'Caffe Nero is an outstanding cafe.'
User: 'what do they serve'
System: 'Caffe Nero is a great cafe.'
User: 'whats the address'
System: 'Caffe Nero is located on 11 Market Street.'
User: 'thank you goodbye'

Student:
Expensive