You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

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

ASSISTANT: Sure, I am here to help you with that. May I know your name please?

USER: My name is Stephen Turner.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting.

USER: My pleasure.

ASSISTANT: There is no reservation found on your name in our database to change.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us, have a great day.