i am wanting a train that leaves on friday and goes to cambridge .
{'service': 'train', 'act': 'request', 'slot_name': 'depart', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'leave', 'value': '?'}
sure thing . what s your departure site and around what time would you like to leave ?