can you help me find a train leaving tuesday from norwich ? thanks . i want to leave after 20:15 .
i have about 19 different trains . do you have a certain time you would like to leave after or arrive by ?
{'service': 'train', 'act': 'inform', 'slot_name': 'time', 'value': '79 minutes'} {'service': 'train', 'act': 'inform', 'slot_name': 'leave', 'value': '20:16'} {'service': 'train', 'act': 'inform', 'slot_name': 'dest', 'value': 'cambridge '}
at 20:16 a train leaves for cambridge duration of which is 79 minutes .