i need a train from london liverpool street . cambridge , on wednesday . no . i just need to leave after 14:00 .
may i ask where you are travelling to ? and what day ? is there a certain time you would like to arrive in cambridge ?
{'service': 'train', 'act': 'offerbook', 'slot_name': 'leave', 'value': '15:39'} {'service': 'train', 'act': 'offerbook', 'slot_name': 'id', 'value': 'tr7978 '} {'service': 'train', 'act': 'offerbook', 'slot_name': 'arrive', 'value': '17:07'}
i have train tr7978 leaving at 15:39 and arriving at 17:07 . would you like to book that ?