hi , what trains do you have on saturday from kings cross ? i need a train that will arrive in cambridge by 21:45 .
we have a total of 10 trains departing from london kings cross every 2 hour -s beginning at 5:17 am .
{'service': 'train', 'act': 'request', 'slot_name': 'people', 'value': '?'}
for how many people ?