You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Karen Moore. Owing to an emergency, I would like to change my reservation.

ASSISTANT: Sure, wait for a while.

USER: Ok.

ASSISTANT: Sorry Karen Moore, there is no reservation found with your name.

USER: Ok, thank you for your information.

ASSISTANT: Thank you.