i need a train from london kings cross to cambridge .
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': '70'} {'service': 'train', 'act': 'request', 'slot_name': 'arrive', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'leave', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'day', 'value': '?'}
i have 70 trains travelling that route . to narrow it down , what day would you like to leave and what time would you like to depart and arrive ?