i would like help finding a train headed to cambridge . departing from london kings cross on tuesday .
i will be happy to help you find a train . can you tell me where you will be departing from ?
{'service': 'train', 'act': 'request', 'slot_name': 'leave', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'arrive', 'value': '?'}
when would you like to leave or arrive by ?