Hello.
user
Hello. How may I serve you?
assistant
I want to change my existing reservation, can you please help me with this?
user
Sure. May I know your name please?
assistant
I am William Robinson.
user
Wait for a moment please. Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it.
assistant
Ok, no problem. Thank you for your information.
user
Thank you.
assistant