Hello.
Hello. How can I assist you today?
I am Edward Evans. I am planning to change an existing reservation, can you help me out to change reservation?
I will help you Evans, let me check.
That's fine, take your own time.
Sorry Evans, I have not found any reservation under your name in our database.
That's really sad to hear. Thank you for  your help.
Thank you for contacting us, have a nice day.