You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

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

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Unfortunately we did not find any reservation on your given name in our records.

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

ASSISTANT: Thank you for opting us.