Hi.
user
Hello.
assistant
I am Alexander Green.
user
How may I assist you?
assistant
I want to change my existing reservation, please help me out.
user
Sure, I am here to help you out.
assistant
Thank you.
user
Wait a moment please.
assistant
Ok.
user
 Alexander Green, we regret to inform you that there is no reservation found on your name in our records.
assistant
No issues thanks for the information.
user
Thank you for reaching us.
assistant