You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this minute?

USER: I would like to change my reservation due to some health issues, can you please help me out with that?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Myself Ronald Wilson.

ASSISTANT: Please give me a minute.

USER: Sure, take your time.

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

USER: That's ok, no problem. Anyway thank you for checking out.

ASSISTANT: Thank you for approaching us.