hi , i need to find a train to cambridge , please . i want to leave from stevenage on saturday .
certainly . from where are you planning to depart , and when ?
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': '10'} {'service': 'train', 'act': 'request', 'slot_name': 'leave', 'value': '?'}
i have 10 trains available . is there a certain time you would like to travel ?