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 the reservation status.

USER: Sure, my name is Raymond Allen.

ASSISTANT: Sorry Raymond Allen, there is no reservation on your name in our database.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.