You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I want to change my existing reservation.

ASSISTANT: May I know your good name please?

USER: Ryan Miller.

ASSISTANT: Thank you Ryan Miller, please wait a moment.

USER: OK.

ASSISTANT: Thanks for waiting, there is no reservation on your name.

USER: Thank you for the information.

ASSISTANT: Thanks for choosing us. Have a good day.