You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service today?

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

ASSISTANT: May I know your name please?

USER: Daniel Phillips here.

ASSISTANT: I am sorry no reservation found on your name.

USER: No issue, thanks for the information.

ASSISTANT: Thank you for choosing us.