You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

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

ASSISTANT: Sure, I will help you. May I know your name to check your previous reservation status?

USER: Myself Carol Jones.

ASSISTANT: Ok Jones, please hold on to check.

USER: Ok.

ASSISTANT: Sorry to inform you that, there is no reservation found with your name in our records.

USER: No problem, thanks for checking.

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