i am looking for a train schedule that departs from cambridge and should go to ely .
{'service': 'train', 'act': 'request', 'slot_name': 'arrive', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'leave', 'value': '?'}
ok , is there any particular time you would like to leave or arrive by ?