i need a train going into cambridge , arriving by 17:45 . i am leaving from bishops stortford on sunday . i would prefer to leave at 15:00 .
where are you departing from and what day are you travelling on ? and what time would you like to leave ?
{'service': 'train', 'act': 'inform', 'slot_name': 'id', 'value': 'tr4651 '} {'service': 'train', 'act': 'inform', 'slot_name': 'leave', 'value': '15:29'} {'service': 'train', 'act': 'inform', 'slot_name': 'depart', 'value': 'bishops stortford'} {'service': 'train', 'act': 'offerbook', 'slot_name': 'none', 'value': 'none'}
the tr4651 train leaves bishops stortford at 15:29 . would you like me to book you a seat on it ?