i am looking for a train that departs from peterborough and goes to cambridge . we will be leaving on sunday afternoon .
i have many trains available . what day would you like to leave ?
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': 'many'} {'service': 'train', 'act': 'request', 'slot_name': 'leave', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'arrive', 'value': '?'}
there are still many trains to pick from , can you narrow down a departure and arrival time frame ?