i am going to cambridge and i need a train that leaves on wednesday . i would like to leave from standsted sometime after 15:30 .
where will you be departing from and what time do you need to arrive in cambridge ?
{'service': 'train', 'act': 'inform', 'slot_name': 'leave', 'value': '16:24'} {'service': 'train', 'act': 'inform', 'slot_name': 'id', 'value': 'tr1342'}
the tr1342 leaves at 16:24