You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Kenneth Moore and I want to change my existing reservation.

ASSISTANT: Sure Moore. Please wait a minute.

USER: OK.

ASSISTANT: Thank you for waiting. Sorry Moore, no reservation found under your name. Thank you for reaching us.

USER: Thanks for your help.

ASSISTANT: Have a great day.