where is the train that arrives at 11:00 and leaves to cambridge ?
{'service': 'train', 'act': 'request', 'slot_name': 'depart', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'day', 'value': '?'}
what day do you wish to travel and where are you departing from ?