You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I need to change my recent reservation, can you please help me?

ASSISTANT: May I know your name?

USER: Myself Brian Hill.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: Than's ok, thank you for searching my details.

ASSISTANT: Thank you for reaching us.