You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you at this moment?

USER: Myself Samuel Williams. I want to change my existing reservation, can you help me in that?

ASSISTANT: Sure, I will help you with it. Please wait while I find your active reservation.

USER: Sure, I will wait.

ASSISTANT: We didn't find any reservation on your name in our system.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you.