You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Kathleen Campbell. I want o modify my existing reservation, can you do that?

ASSISTANT: Sure, please wait a moment I will check and let you know.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, thanks for informing me.

ASSISTANT: Thank you for reaching us.