i am looking for a train departing from cambridge going to birmingham new street . wednesday leaving after 21:00 please .
what day and time would you like to travel ?
{'service': 'train', 'act': 'inform', 'slot_name': 'arrive', 'value': '24:44'} {'service': 'train', 'act': 'inform', 'slot_name': 'leave', 'value': '22:01'} {'service': 'train', 'act': 'inform', 'slot_name': 'id', 'value': 'tr8873 '} {'service': 'train', 'act': 'offerbook', 'slot_name': 'none', 'value': 'none'}
tr8873 leaves at 22:01 and arrives at 24:44 . would you like me to book ?