You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you for the day?

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

ASSISTANT: Sure, I am mirthful to help you with that reservation change. May I Know your name please?

USER: Sure, I am Anna Young.

ASSISTANT: Please wait for a moment, let me check your previous reservation status.

USER: Sure.

ASSISTANT: Sorry to tell you that, there is no active reservation found with your name in our database to change it.

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

ASSISTANT: Thank you for reaching us. have a nice day.