hi , i am heading to birmingham new street so please find me a train that leaves on friday
{'service': 'train', 'act': 'request', 'slot_name': 'depart', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'leave', 'value': '?'}
are you leaving from cambridge ? is there a time you would like to leave ?