You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I am glad to help you. May I know your name please to check your previous reservation status?

USER: Sure, Justin Anderson here.

ASSISTANT: Please hold on a moment, I will revert you.

USER: Sure.

ASSISTANT: Justin Anderson, there is no active reservation on your name in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.