Hi.
Hello, how may I assist you?
I want to change my existing reservation. Can you help me for this one?
Sure, I am here to assist you. May I know your name please?
Sure, Ryan Miller here.
I am really sorry to tell  you, there is no active reservation found with your name to change the details.
 No issues, thank you for the information.
My pleasure to inform you, thank you for opting us.