could you help me with planning my trip ? i need a train . yes , on sunday i'll be departing from cambridge and going to stevenage . i would like to leave after 17:00 .
i can absolutely help you . can you tell me your departure and arrival stations ?
{'service': 'train', 'act': 'inform', 'slot_name': 'leave', 'value': '17:21'} {'service': 'train', 'act': 'inform', 'slot_name': 'id', 'value': 'tr7729'}
train tr7729 would probably fit your needs . it leaves at 17:21 .