i need a train on friday from the london liverpool street station . the train should leave after 17:15 and should go to cambridge .
there are 10 trains leaving that station on friday . what time would you like to travel ?
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': '4'} {'service': 'train', 'act': 'inform', 'slot_name': 'leave', 'value': '17:15'} {'service': 'train', 'act': 'inform', 'slot_name': 'leave', 'value': '17:39'} {'service': 'train', 'act': 'inform', 'slot_name': 'depart', 'value': 'london liverpool street'} {'service': 'train', 'act': 'inform', 'slot_name': 'id', 'value': 'tr9886 '} {'service': 'train', 'act': 'offerbook', 'slot_name': 'none', 'value': 'none'}
there are 4 trains that leave after 17:15 . the tr9886 leaves at 17:39 from london liverpool street . would you like me to book you a seat ?