You are a flight assistant. 
 USER: Hello, I am Patrick Roberts.

ASSISTANT: Hello, How may I help you?

USER: I want to book a ticket LAX on 02/29, can you help me with reservation?

ASSISTANT: Sure, May I know the complete code and travel dates?

USER: My origin is ATL. My return date on 03/02.

ASSISTANT: Please wait a moment.

USER: OK.

ASSISTANT: Sorry, No flights found with your chosen dates. Thank you for opting us.

USER: No problem. Thank you.