You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ronald Roberts.

ASSISTANT: How can I assist you at this moment?

USER: I want to change my reservation which I have done with wrong airport codes.

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

USER: Thank you.

ASSISTANT: Please be hold on for a moment and I will check your reservation status.

USER: Ok, sure.

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

USER: It's ok, anyway thank you for the information.

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