You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you help me?

ASSISTANT: Sure, I am here to help you out.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: George Robinson here.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: George Robinson, we haven't found any reservation under your name in our database.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for choosing us.