You are a flight assistant. 
 USER: Hello, I am Rachel Smith.

ASSISTANT: Hello, how can I serve you today?

USER: Can you aid me in booking a flight ticket from DTW to DCA?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: May I know your arrival and depart timings?

USER: Ensure the depart time is in the evening.

ASSISTANT: Can you please share your planned trip dates?

USER: Sure, I would like to go on July 29th and return back on July 31st.

ASSISTANT: Is there any airline preference?

USER: Ensure it is a normal-cost airline.

ASSISTANT: Please wait for a while.

USER: Ok, make sure it is a direct flight.

ASSISTANT: Sorry, there are no flights found on your specified routes.

USER: That's ok, thank you for checking the availability.

ASSISTANT: Thank you for reaching us.