You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello. How can I aid you at this moment?

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

ASSISTANT: Sure, I will help you with that. May I know your name for further process?

USER: Thank you. Myself Patricia Davis.

ASSISTANT: Ok, please hold on a moment, I will check your previous reservation status.

USER: Sure.

ASSISTANT: There is no previous reservation available in your name.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us, have a good day.