i want to try food in cambridge and need to get a train to stevenage that leaves after 14:45 .
{'service': 'train', 'act': 'inform', 'slot_name': 'leave', 'value': "every 2 hours on the :21's"} {'service': 'train', 'act': 'request', 'slot_name': 'day', 'value': '?'}
hello , trains depart every 2 hour -s on the :21 s , what day are you hoping to travel ?