yes . i am looking for a train , please . i need to leave from cambridge on sunday .
of course . where will you be departing from and arriving ? when would you like to leave ?
{'service': 'train', 'act': 'inform', 'slot_name': 'day', 'value': 'sunday'} {'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': '202'} {'service': 'train', 'act': 'inform', 'slot_name': 'depart', 'value': 'cambridge'} {'service': 'train', 'act': 'request', 'slot_name': 'leave', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'dest', 'value': '?'}
there are 202 trains leaving cambridge on sunday , do you have a destination or time ?