i just need a little help booking a train from cambridge . to bishops stortford i need to arrive by 12:45 on tuesday .
where are you traveling to ?
{'service': 'train', 'act': 'request', 'slot_name': 'day', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'leave', 'value': '?'}
what time do you need to depart and on what day ?