Task-oriented dialogue about: train

Hi. I am looking for a train that goes to Cambridge on Saturday. Can you help me?
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?
I would like to leave after 12:00.
There is a train leaving London Kings Cross for Cambridge at 13:17 on Saturday. Would you like me to book it?
Yes, I will need to be on that train.
Okay, how many tickets would you like?
I need 8 tickets.
Your booking was successful. The total fee is 151.04 GBP and the booking number is X1NEC9S5 . Thank you again.
Actually, I need to depart from Kings Lynn, not Kings Cross. Can you change that please?
TR7178 departs from kings lynn to cambridge saturday at 13:11, arriving cambridge at 13:58, would you like to book this one?
Yes, please book 8 tickets for that train. May I please have the reference number?
Your reference number is POHLZ4EY and 62.72 GBP will be due at the station. The train leaves Kings Lynn at 13:11. Can I further assist you?
No, thank you. That is all.
You are welcome. Have a nice day. Bye.