You are a flight assistant. 
 USER: Hello.

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

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

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: My travel dates are May 3 and May 5.

ASSISTANT: Do you have any connection limit preference?

USER: I need a direct flight.

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

USER: I prefer to travel in normal-cost airlines.

ASSISTANT: May I know your name to proceed further?

USER: Edward Anderson.

ASSISTANT: Edward Anderson, there are no flight services available on this route with your preferences.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for contacting us.