You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, I am glad to help you. May I know your good name to proceed further?

USER: Thank you. Yes, I am Patricia Lee.

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

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

ASSISTANT: Thank you.