Task-oriented dialogue about: train

I'm looking for a train. The train should depart from cambridge and should go to london liverpool street
I can help with that! What day will you be traveling?
Tuesday, leaving sometime after 19:45.
Train TR3515 will be leaving Cambridge at 19:59 on Tuesday, and will arrive at London Liverpool Street by 21:27. Would you like me to book it for you?
Yes please! Could you please give me a price?
The price is 16.60 pounds. How many tickets will you be needing?
thank you very much,that's2 all
If you'd like us to reserve tickets for you, please keep us in mind. We would be happy to help with that.
sure i will, thank you
You're welcome and thanks for using our help desk. Goodbye.