hey there , i want to get a train to cambridge for thursday please i am coming in from the stansted airport .
okay , from where are you departing ?
{'service': 'train', 'act': 'request', 'slot_name': 'leave', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'arrive', 'value': '?'}
what time will you need to be traveling ?