Hello. Myself Robert Harris.
Hello, how may I serve you at this moment?
I want to change my existing reservation, can you help me in that?
Sure, I will help you. Please wait for a while.
Thank you. I will wait for your response.
Take your time. Sorry, there is no reservation existing on your name.
That's ok, no problem. Thank you for the information.
You are welcome, have a nice day.