You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, I am happy to help you. May I know your good name?

USER: My name is Ronald Parker.

ASSISTANT: Sorry, there is no active reservation on your name in our records.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for opting us.