i am trying to find out about trains that arrive in cambridge
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': 'quite a few'} {'service': 'train', 'act': 'inform', 'slot_name': 'dest', 'value': 'cambridge'} {'service': 'train', 'act': 'request', 'slot_name': 'depart', 'value': '?'}
there are quite a few trains coming into cambridge . where will you be departing from ?