Hi.
Hello, may I assist you?
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, I can help you with that. Can I know your name?
Sure, my name is James Walker.
James Walker, sorry to inform you their is no reservation under your name.
Ok, no problem.
Thank you for reaching us.
Thank you for checking.
Have a great day, keep reaching us in future.