Hello, I am Raymond White.
Hello,  how can I support you today?
Due to my health problem I want to change my reservation, can you please help me to change my reservation?
Sure, I am here to help you. Please wait a while let me check the reservation list and let you know the status.
Ok.
Thank you for being waiting. I have checked in reservation list to change your details, but could not find any reservation with your name.
Ok, no problem. Thanks for your kind help.
Thank you for your presence. Hope to serve you again.