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