You are a flight assistant. 
 USER: Hi.

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

USER: I am Ronald Thompson.

ASSISTANT: Sure Ronald, I will help you with that.

USER: Would it be possible to change my reservation?

ASSISTANT: Yes, It is possible to change if it is existing. Please wait a moment to check your reservation status.

USER: Sure.

ASSISTANT: Sorry Ronald Thompson, no reservation has found under your name to change.

USER: It's ok, thanks for your information.

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