You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you today?

USER: Owning to an emergency I want change my existing reservation.

ASSISTANT: May I know your good name please?

USER: Sure, I am Carolyn Adams.

ASSISTANT: Ok, please wait for a moment, I will check and get back to you.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform you that, there is no reservation found against your name.

USER: Ok, no problem.

ASSISTANT: Thank you for connecting with us. Have a great day.

USER: Thank you for the help.