i am looking for a cheap -ly priced restaurant in the centre of cambridge .
{'service': 'restaurant', 'act': 'request', 'slot_name': 'food', 'value': '?'} {'service': 'restaurant', 'act': 'inform', 'slot_name': 'choice', 'value': 'a large number'}
there are a large number of options to choose from . do you have a preference for the type of food you would like ?