You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for today?

USER: Please book the flight ticket from Houston HOU to Austin AUS.

ASSISTANT: I am here to help you about that, can you please provide your planned dates of journey?

USER: Thank you, my planned trip dates are on Nov 18 and return on Nov 20.

ASSISTANT: Do you need any connecting flight for your journey?

USER: I need a direct flight to travel.

ASSISTANT: Do you need any other requirement for your journey?

USER: No, thanks for asking.

ASSISTANT: Can you please let me know your name for further proceeding?

USER: Ok, my name Jessica Scott.

ASSISTANT: I regret to say this Jessica Scott, there are no flights which travel to your region on your planned dates of journey.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: You are welcome, thank you for reaching us.