Hello.
Hello, how may I aid you?
I am Dennis Mitchell.
Hello Dennis.
I want to alter my reservation, due to postponement of concert to be held at the place where I wanted to visit, can you please take your some time for helping me?
Sure, wait a moment to check your reservation status.
Ok.
Sorry Dennis, we don't found any reservation under your name.
Oh, It's ok. Thank you for your information.
Thank you for reaching us, have a great day.