is there a train from cambridge that arrives by 13:45 ?
{'service': 'train', 'act': 'request', 'slot_name': 'dest', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'day', 'value': '?'}
i found several trains that meet your criteria . would you like to narrow your search by picking a particular day or a certain destination ?