You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to book a flight ticket from IAD to DCA, can you please help me?

ASSISTANT: Sure, let me know your trip dates please?

USER: Thank you for taking my request, I planned my trip on the dates Feb 28 and Mar 1.

ASSISTANT: May I know your connection limit?

USER: Sure, I am looking for a connecting flight.

ASSISTANT: Do you need any other preference?

USER: Yes, at the time of take off I prefer evening flight.

ASSISTANT: Can I know your name please to proceed further?

USER: Please book the ticket on the name Scott Wilson.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thanks for contacting us.