i need a train to cambridge . get me 1 that arrives by 13:00
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': 'over 500'} {'service': 'train', 'act': 'request', 'slot_name': 'depart', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'day', 'value': '?'}
there are over 500 results . where are you leaving from ? and what day ?