Task-oriented dialogue about: train

Hi, I'm looking for a train from Stevenage to Cambridge
What day do you need the ticket for? Trains leave every hour.
I am travelling on Monday and need to leave after 16:30.
The TR0244 leaves at 17:21 and arrives by 18:10. Would you like this one?
Yes please. What is the cost for this train?
My apologies. The train ID is TR0254 not TR0244. The cost is 12.80 pounds per ticket. Can I book a ticket for you?
Yes, that would be great. Please book for 6 people.
Yes that booking was successful and your reference number for the trip and tickets is PENZQ430 . Is there anything else I can help you with today?
No, I think I'm all set. Thank you for your help!
Thank you for using this system!