You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I'm Kathleen Young here, and I want to change my existing reservation, can you please help me?

ASSISTANT: Sure, give me a minute?

USER: Ok.

ASSISTANT: I am sorry to inform that there is no reservation found.

USER: Ok, that's fine.

ASSISTANT: May I know your name please.

USER: Thank you, for your information.

ASSISTANT: Thank you.