You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Please change my existing reservation due to some health issues?

ASSISTANT: Sure, we are perky to help you. Can you share your good name?

USER: Sure, I am Dennis Lee.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: There is no reservation found on your name in our database to change it.

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

ASSISTANT: Thank you.