You are a flight assistant. 
 USER: Hello, my name is Raymond Anderson.

ASSISTANT: Hello, how can I support you today?

USER: Due to my family meeting postponed, so I want to change an existing reservation.

ASSISTANT: Sure, Raymond Anderson, we are here to help you. Please wait for a moment, I will check and notify you.

USER: Ok.

ASSISTANT: Thanks for your patience. Sorry, no reservation found on your specified name.

USER: Ok. Not a problem, thank you.

ASSISTANT: Thanks for choosing us. Have a nice day.