i am looking for a train to london kings cross to arrive at 16:00 . can you help with that ? saturday departing from cambridge .
yes , what is the day you will travel ?
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': 'several '} {'service': 'train', 'act': 'request', 'slot_name': 'leave', 'value': '?'}
i see several trains . when would you like to leave ?