i am looking for a train . i need to leave on tuesday and want to arrive by 20:45 . i am heading to cambridge , and i would like to leave from peterborough .
where are you departing from ? and where would you like to go ?
{'service': 'train', 'act': 'inform', 'slot_name': 'arrive', 'value': '20:38'} {'service': 'train', 'act': 'inform', 'slot_name': 'leave', 'value': '19:48'} {'service': 'train', 'act': 'inform', 'slot_name': 'dest', 'value': 'cambridge'} {'service': 'train', 'act': 'inform', 'slot_name': 'id', 'value': 'tr2673'}
the last train into cambridge before 20:45 is the tr2673 , arriving at 20:38 . you would leave peterborough at 19:48 .