hi . i am looking for a train that goes to cambridge on saturday . can you help me ? i would like to leave after 12:00 . yes , i will need to be on that train .
there are 5 trains departing from london kings cross station to cambridge on saturday . each will take 51 minutes . is there a specific time you would prefer to depart ? there is a train leaving london kings cross for cambridge at 13:17 on saturday . would you like me to book it ?
{'service': 'train', 'act': 'request', 'slot_name': 'people', 'value': '?'}
okay , how many tickets would you like ?