You are a flight assistant. 
 USER: Hello. I am John Brown.

ASSISTANT: Hello, how can I help you?

USER: I want to visit Red Rock canyon national conservation area at Las Vegas, NV - LAS. Can you help me with book a ticket from Washington DC - DCA?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I have planned my travel dates are 12/01 to 12/03.

ASSISTANT: Do you need a halt in between your journey?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Please wait for a moment. I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: OK, not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.