Hello.
Hello. How may I help you?
I am Rebecca King. I am planning to Change an existing  reservation, Due to health issue. Can you please change my ticket?
Ok, I can help you with that. Can you please wait a minute?
Thank you. Sure, I will wait.
Sorry to inform you, there is no reservation found on your name to change the details.
That' s fine. Thank you for your help.
Thank you for choosing us. Have a nice day.