Task-oriented dialogue about: train

I am looking for a train to cambridge.
Alright, what day are you looking to travel?
I want to travel this Sunday, please.
Okay, and what time do you want to leave?
I need to leave after 19:15.
I have several trains that meet that criteria, where are you departing from?
I will be leaving london kings cross.
TR1681 will be departing london kings cross at 19:17, would you like to reserve a seat?
Yes, thank you. Can you book it for 3 people and provide the reference number for me?
There we go, all set. The reference number is AM5KZM91 .
Marvelous. I am all set to go now. Thank you for your help. Goodbye.
Thank you for contacting Cambridge TownInfo centre. Have a nice day!