Task-oriented dialogue about: train

I need to get a train out of cambridge.
Your looking at the trainID of TR5767 or TR2000 depending on your time
The train should go to stansted airport and should arrive by 21:30.
What day of the week are you looking at traveling?
I would like to leave on Tuesday.
these three could help trainID departure destination day leaveAt arriveBy price duration book (optional) TR1656 cambridge stansted airport tuesday 05:40 06:08 10.10 pounds 28 minutes TR1951 cambridge stansted airport tuesday 06:40 07:08 10.10 pounds 28 minutes TR0684 cambridge stansted airport tuesday 07:40 08:08 10.10 pounds 28 minutes
thank you for your help. book for me 5 seats and get me the reference numberes
I'm sorry, could you confirm which train you wanted to book seats on? There were 3 choices given to you.
Whichever train goes to stansted airport Tuesday from cabridge arriving closest to 21:30.
Booking was successful, the total fee is 50.5 GBP payable at the station. Reference number is : GMYBPE6F .
Thanks for that. I don't need anything more today.
ok. enjoy your day.