i am looking for a train departing from cambridge on wednesday . i am attending a seminar in ely .
okay . what is your destination ?
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': '10'} {'service': 'train', 'act': 'inform', 'slot_name': 'leave', 'value': '05:50'} {'service': 'train', 'act': 'request', 'slot_name': 'arrive', 'value': '?'}
there are 10 trains on that route starting at 05:50 . to make sure i book the right 1 what time do you need to arrive ?