You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Brandon Smith here.

ASSISTANT: How can I assist you now?

USER: I want to attend a Marriage in Las Vegas. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you. May I know your travelling dates?

USER: My travelling dates are 07/02 and 07/04.

ASSISTANT: Please help me with your airport codes.

USER: My airport codes are DEN and LAS.

ASSISTANT: Do you prefer any halt in between journey?

USER: I would prefer single halt.

ASSISTANT: Is there any other specifications for you?

USER: I would depart on evening.

ASSISTANT: Thanks for providing details, sorry no flights are available on your journey routes.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for availing us.