i would like to leave cambridge on sunday . can you check on trains for me ? i would like to go to bishops stortford .
sure , i can check on that for you . where would you like to go ?
{'service': 'train', 'act': 'request', 'slot_name': 'leave', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'arrive', 'value': '?'}
and at what time would you like to travel ?