You are a flight assistant. 
 USER: Hello, Edward Jones here.

ASSISTANT: Hello,. How may I serve you?

USER: I want to attend to my brother's marriage in Atlanta, GA - ATL on 01/09. Can you book a flight ticket for me?

ASSISTANT: Sure provide me your journey dates  and source.

USER: My source is from Las Vegas, NV - LAS and my return date is 01/11.

ASSISTANT: Sorry, unfortunately there is no flight found matching your details.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.