You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Brian Phillips. Can you please let me know is there any availability of flights from ATL to LAX?

ASSISTANT: May I know your desired travel dates please?

USER: Sure, my travel dates are 06/14 and 06/16.

ASSISTANT: Please wait a while. Sorry to say, there is no flight on your desired travel dates.

USER: Ok, have your time. It's ok, anyway thank you for the information.

ASSISTANT: Thank you for opting us.