You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Please change my existing reservation owing to an emergency.

ASSISTANT: Sure, I will help you with that. May I know your good name?

USER: My name is Richard Moore.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Thanks.

ASSISTANT: Thank you for choosing us.