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: 'i need an italian restaurant'
System: 'What part of town do you have in mind? For example, something in the Barnwell, Romsey, or Trumpington area.'
User: 'trumpington'
System: 'There is no restaurant in the Trumpington area and serving italian food.'
User: 'central'
System: 'Can I help you with anything else?'
User: 'italian restaurant in the central area'
System: 'Strada, which is in the central part of town, is an outstanding restaurant. It serves italian food.'
User: 'phone number'
System: 'Strada is on 17 Trinity Street and its phone number is 01223352166.'
User: 'thank you goodbye'
