i need a train to cambridge on monday . i am leaving ely i need to arrive by 11:15 .
can you tell me where you will be departing from ?
{'service': 'train', 'act': 'inform', 'slot_name': 'arrive', 'value': '9:52'} {'service': 'train', 'act': 'inform', 'slot_name': 'leave', 'value': '9:35'} {'service': 'train', 'act': 'inform', 'slot_name': 'depart', 'value': 'ely '} {'service': 'train', 'act': 'inform', 'slot_name': 'dest', 'value': 'cambridge '} {'service': 'train', 'act': 'inform', 'slot_name': 'id', 'value': 'tr2987 '} {'service': 'train', 'act': 'offerbook', 'slot_name': 'none', 'value': 'none'}
tr2987 leaves ely at 9:35 and arrives in cambridge at 9:52 . would you like to book a seat ?