hi , i am looking for a train that s departing cambridge and going to london liverpool street .
{'service': 'train', 'act': 'request', 'slot_name': 'leave', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'day', 'value': '?'}
i have the listings up for you , what date and time will you need that train ?