You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my reservation due to health problem, can you hep me?

ASSISTANT: Sure, I am happy to help you. Please wait, let me check your reservation status in our database. May I know your name?

USER: Sure. Myself Emma King.

ASSISTANT: Sorry King, I have not found any reservation under your name in our database.

USER: No problem, thanks for checking.

ASSISTANT: You are most welcome.