You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Daniel White, I would like to change my recent reservation because of some personal work, can you help me with this?

ASSISTANT: Just a moment please.

USER: Sure.

ASSISTANT: I am sorry no reservation found on your name.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for choosing us.