You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you?

USER: Please change my active reservation.

ASSISTANT: Sure, may I know your name?

USER: Myself Karen Young.

ASSISTANT: Give me a minute for chceking.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.