Task-oriented dialogue about: train

I am looking for a train to stevenage.
Ok. Where are you leaving out of?
I'm leaving out of Cambridge.
Great there are 70 trains, do you have a day or time?
I need to arrive by 9:30 on Thursday.
TR2016 leaves at 05:21 and arrives by 06:10. Would you like to book this train?
Yes for 4 people please. I will need the reference number.
4 tickets to arrive by 9:30!
Can I have the reference number for the train booking please?
I have another train that leaves at 07:21 and arrives at 08:10 if that would be better?
That is not better. I would like a reference number for the 4 tickets already booked, please.
Sure thing. The reference number is L130XFN9 . How else may I help?
Thanks. That's all I need. Have a good day.
You as well, enjoy your trip!