You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I need to change my existing reservation because of some health issue. Can you help me with that?

ASSISTANT: Sure, may I know your name please?

USER: I am Joseph Moore.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no reservation found as per your name in our database.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us with a query.