Hello.
Hello. How glad that I can assist you now?
I want to change my existing reservation, due to some health issue. Can you help me?
Sure, I am glad to help you with that one.
Thank you for accepting my request.
Can I know your name please?
Yes, I am Betty Harris.
Please give me a moment.
Sure.
 Thank you for waiting, I have checked in reservation list to change your ticket but could not find any reservation with your name.
Ok, not an problem. Anyway, thank you for your information.
You are most welcome and thank you for approaching us, have a nice day.