I need some help locating a train for Saturday, heading to London King's Cross. Where will you be departing from, and what time would you like to travel? I'll be departing from Cambridge and would like to leave at 12:15. There isn't a train that leaves at 12:15. The closest one leaves at 13:00 and arrives in London Kings Cross at 13:51. Shall I book it for you? That would be perfect. Book it for 5 people please and send me the reference number. Okay, the booking was successful, the total fee is 94.4 GBP payable at the station . Your reference number is : AJTE5TLW. Is there anything else I can do for you?