Task: Dialogue State Tracking
Input (English): 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: 'cafe food restaurant'
System: 'What kind of price range are you looking for? For example, expensive, free, or moderate.'
User: 'expensive'
System: 'What kind of price range are you looking for? For example, cheap, or free.'
User: 'expensive'
System: 'There is no restaurant serving cafe food in the expensive price range.'
User: 'then cheap cheap'
System: 'There is no restaurant serving cafe food in the expensive price range.'
User: 'sil'
System: 'Would you like a cafe food, or you don't care?'
User: 'cafe'
System: 'Would you like a cafe food, or you don't care?'
User: 'cafe food'
System: 'Would you like an expensive price range, or you don't care?'
User: 'a cafe food'
System: 'Would you like an expensive price range, or you don't care?'
User: 'sil'
System: 'Would you like an expensive price range, or you don't care?'
User: 'cafe'
System: 'Would you like an expensive price range, or you don't care?'
User: 'yes'
System: 'Would you like an expensive price range, or you don't care?'
User: 'cheap'
System: 'Would you like a venue with a cheap or expensive price range?'
User: 'no'
System: 'Would you like a venue with a cheap or expensive price range?'
User: 'yes cheap'
System: 'Subway is an outstanding restaurant. It serves cafe food. It's in the cheap price range.'
User: 'thank you and goodbye'

Output (English): Cheap