You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you out?

USER: Please change my existing reservation owing to an emergency.

ASSISTANT: Sure, we are happy to help you. May I know your good name?

USER: I am Karen Wright.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, we are sorry to inform you that, there is no active reservation on your name.

USER: Thanks.

ASSISTANT: Thank you for opting us.