You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I'm Kevin Clark and I want to book a ticket from Las Vegas, NV - LAS.

ASSISTANT: May I know your destination airport code?

USER: I want to visit Dallas & Fort Worth, TX - DFW.

ASSISTANT: Can you share your journey dates please?

USER: Sure, I want to start my journey on 06/04 and fly back on 06/06.

ASSISTANT: Kevin, no flights have been found on your requested dates.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for choosing us.