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: 'sil'
System: 'What kind of venue are you looking for? For example, a cafe, or a pub.'
User: 'middle eastern restaurant'
System: 'Al Casbah, which serves mediterranean and middleeastern food, is a great restaurant.'
User: 'moderate price range'
System: 'Al Casbah is a great venue. The price for main courses ranges from 8 pounds 95 to 12 pounds 95.'
User: 'address phone number and postcode'
System: 'Al Casbah is located on 62 Mill Road. Its phone number is 01223579500. It's in the area with the postcode CB1 2AS.'
User: 'thank you goodbye'
Question: 'Did the user ask for the phone number of the restaurant?'

Output (English): Yes