You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to book the flight ticket from HOU to DCA. Can you please help me?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable travel dates?

USER: My travel dates are Mar 2 and Mar 4.

ASSISTANT: May I know your name please?

USER: Paul Smith.

ASSISTANT: Would you like to board a connecting flight or direct flight?

USER: I need a single connection flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry to say that, there are no flights found on this route as per your travel dates.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for reaching us, have a great day.