Hi.
user
Hello. How may I help you?
assistant
Can you please help me out in changing my existing reservation?
user
May I know your name to check your reservation?
assistant
Yes, my name is Robert Clark.
user
Ok, please wait.
assistant
Ok.
user
I am sorry to say you that there is no reservation found under your name in our database.
assistant
That's ok, thank you for the response.
user
Welcome Robert Clark.
assistant