i would like a train to cambridge that leaves after 17:00 .
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': 'many'} {'service': 'train', 'act': 'request', 'slot_name': 'depart', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'day', 'value': '?'}
there are very many trains that fit your requirement -s , where are you leaving from and what day would you like to leave ?