You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist 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. Can I have your name please for checking your reservation status?

USER: Myself Virginia Young.

ASSISTANT: Ok, please be hold on for a moment to check your reservation status.

USER: Ok.

ASSISTANT: Sorry Virginia Young, no reservation has found under your name to change.

USER: No problem, thanks for checking.

ASSISTANT: My pleasure. Thank you for choosing us, have a great day.