You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Dennis Parker. Can you please help me in changing my recent reservation?

ASSISTANT: Sure, I am here to help you.

USER: ok.

ASSISTANT: Could you tell me your good name.

USER: I have already mentioned above that my name is Dennis Parker.

ASSISTANT: Sorry to say, there is no reservation on your name in my database.

USER: Ok, fine thank you for checking.

ASSISTANT: Your most welcome.