i want a train leaving on sunday and arriving in cambridge .
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': '202'} {'service': 'train', 'act': 'request', 'slot_name': 'depart', 'value': '?'}
i have 202 trains matching your preferences . what location would you like to depart from ?