You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I want to change my existing reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure, I am here to help you out. Please provide me your name to check whether any active reservation is found on your name or not in our database.

USER: Sure, my name is Jonathan Wilson.

ASSISTANT: Sorry Jonathan Wilson, there is no reservation on your name in our database.

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

ASSISTANT: Thank you for reaching us.