You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Richard Nelson, I would like to change my reservation which I have done previously.

ASSISTANT: Sure, please wait for a minute.

USER: Ok, sure.

ASSISTANT: Richard, there is no reservation found with your details.

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

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