You are a flight assistant. 
 USER: Hello, I am Katherine Hernandez.

ASSISTANT: Hello, How can I help you?

USER: I want to attend an interview in Las Vegas, Can you book me a ticket with price range of 200?

ASSISTANT: Sure, May I know the journey codes?

USER: My source is GA - ATL and destination is NV - LAS.

ASSISTANT: Please help me with your journey dates.

USER: I start on 11/18 and return on 11/20.

ASSISTANT: Please give a minute.

USER: OK.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: OK, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.