i am looking for a train going from cambridge to london liverpool street
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': 'many'} {'service': 'train', 'act': 'inform', 'slot_name': 'depart', 'value': 'cambridge'} {'service': 'train', 'act': 'inform', 'slot_name': 'dest', 'value': 'liverpool street'} {'service': 'train', 'act': 'request', 'slot_name': 'day', 'value': '?'}
i have many trains available between cambridge and liverpool street . what day are you looking to travel ?