You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: Nancy Young here. I need to change my recent reservation because my health condition was not good, can you help me?

ASSISTANT: Sure Nancy Young, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Sure, take your own time.

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

USER: That's ok, thank you for checking.

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