i need a train on friday from the london liverpool street station .
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': '10'} {'service': 'train', 'act': 'inform', 'slot_name': 'day', 'value': 'friday'} {'service': 'train', 'act': 'request', 'slot_name': 'leave', 'value': '?'}
there are 10 trains leaving that station on friday . what time would you like to travel ?