i need to find out if there s a train going to stansted airport that leaves after 12:30 . yes i will be leaving on tuesday .
we have a train leaving on friday by 12:40 from cambridge to stansted airport but we need to know your departure point and date of departure to serve you better
{'service': 'train', 'act': 'request', 'slot_name': 'arrive', 'value': '?'}
when would you like to arrive by ?