i need a train that is departing from cambridge and is leaving after 12:15 . i need to go to stansted airport .
sure , let s narrow down your search . what is your destination ?
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': 'a lot'} {'service': 'train', 'act': 'request', 'slot_name': 'arrive', 'value': '?'}
okay we have a lot of trains that meet your requests , is there a specific time you want to get to the airport by ?