You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your assistance?

USER: Can you please help me in booking a flight ticket from Dallas, DFW to reach Washington, DCA?

ASSISTANT: Sure, help me with the trip dates?

USER: My journey dates are from Feb 23 to Feb 25.

ASSISTANT: May I know your name please?

USER: My name is Angela Baker.

ASSISTANT: Do you have any other requirements for this trip?

USER: Usually I prefer direct flight, If it is not there please proceed with single stopover flight.

ASSISTANT: Thank you for your details, there are no flights available at this moment for you to book a ticket.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.