You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, we are here to help you.

USER: Thanks.

ASSISTANT: May I know your good name please?

USER: My name is Kevin Clark.

ASSISTANT: Please wait a minute.

USER: Ok, I will wait.

ASSISTANT: Sorry, there is no active reservation on your name to change.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.