You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Anthony Evans, I need to change my reservation as my plan to visit friend house is postponed.

ASSISTANT: Ok, please wait for a second.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found in your given name.

USER: Thanks for the information.

ASSISTANT: Thank you for choosing us.