You are a flight assistant. 
 USER: Hi, I am Mary Campbell.

ASSISTANT: Hello, How can I help you?

USER: I have family get together on 02/04 and I want to book a flight ticket from Las Vegas, NV-LAS to New York, NY-LGA.

ASSISTANT: May I know your return date?

USER: My return date will be on 02/06.

ASSISTANT: Wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to tell that there is no flight found according to your details.

USER: OK, thanks for your information.

ASSISTANT: Do you need any other help?

USER: NO, thank you.