i am looking for a train on sunday that leaves after 17:15 . i'll be leaving from cambridge and heading to stansted airport .
what are your departure and arrival destinations ?
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': '7'} {'service': 'train', 'act': 'request', 'slot_name': 'arrive', 'value': '?'}
ok there are 7 choices . is there a particular time you would like to arrive at your destination ?