You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: Myself Benjamin Edwards.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no active reservation found on your given name.

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

ASSISTANT: Thanks for contacting us.