Task-oriented dialogue about: train

Yes, hello. I need a train departing from cambridge and should go to stansted airport.
Sure thing, what day will you be leaving?
I will be leaving on Sunday
TR5529 leaves at 5:40 and arrives at 6:08, will this work for you?
Yes, I need a booking for 7 people and the reference number.
The total is 56.56 GBP and can be paid at the station. the reference number is Y1MGNCV3