You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning this weekend to travel Dallas. Can you please help me in reserving the ticket from HOU to DFW?

ASSISTANT: Sure, may I know your trip dates please?

USER: I am planning my trip on Nov 18 and again I will return back on Nov 20.

ASSISTANT: Do you have any other requirements?

USER: My return time is afternoon.

ASSISTANT: Can I know your name please?

USER: Myself Timothy Hernandez.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Not a big issue, anyhow thank you very much for your kind information.

ASSISTANT: Most welcome.