Hi.
Hello, how may I aid you today from my end?
Myself Nancy Parker. I want to change my existing reservation, can you help me in that?
Sure, I am glad to help you out. Please allow me a moment.
Sure, I will wait for your response.
Sorry  Nancy Parker, there is no reservation on your name in our database.
That's ok, no problem. Thank you for the information.
Thank you for your reaching us.