You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicole Moore.

ASSISTANT: How can I best assist you?

USER: Can you change my existing reservation?

ASSISTANT: Sure, I am here to assist you. Please wait a while.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry to inform you that there was no reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for contacting us.