You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my existing reservation due to some issues, can you please help me with that?

ASSISTANT: Yes, I will help you in change of flight ticket reservation. May I know your name please?

USER: I am James Young.

ASSISTANT: Please wait for a moment. I will check it and let you know.

USER: Sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it.

USER: Ok, not an issue. Thank you for your information.