You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I need to change my reservation due to postponed of my wedding shopping. Can you please help me in changing?

ASSISTANT: Sure, May I know your name?

USER: Jack Lee is my name.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for opting us.