You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Would it be possible to change my recent reservation?

ASSISTANT: Sure, I am here to help you out.

USER: Thanks.

ASSISTANT: May I know your name please?

USER: Ok, I am Cynthia Taylor.

ASSISTANT: Wait a moment please.

USER: Sure, take your time.

ASSISTANT: Cynthia Taylor, we haven't found any reservation under your name in our database.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for choosing us.