You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I am Jack Jones. I am planning to travel from DFW to DCA, help me in booking a flight?

ASSISTANT: Sure, please provide your dates of journey.

USER: My travelling dates are Mar 21 to Mar 23.

ASSISTANT: Do you have any specifications?

USER: I want direct flight.

ASSISTANT: Please hold for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, there are no flights available based on your details.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for availing us.