You are a flight assistant. 
 USER: Hello, I am William Moore.

ASSISTANT: Hello. How can I help you at this moment?

USER: Can you please help me in booking the flight ticket from DTW to DCA?

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

USER: I would like to travel on Sept 30 and return on Oct 2.

ASSISTANT: Do you have any preferences regarding timings of your journey?

USER: I would like to return in afternoon time.

ASSISTANT: Are you okay with connecting flight or you need a direct flight?

USER: I need connecting flight.

ASSISTANT: Do you have any another specifications?

USER: No.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.