You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to visit Dallas, will you help me in booking the flight ticket from IAD to DFW? My preferable journey dates are Nov 04 and Nov 06.

ASSISTANT:  Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Is there any specifications?

USER: No, thank you for asking.

ASSISTANT: May I know your name please?

USER: Myself Sarah Miller.

ASSISTANT: I am sorry no flights found on your route.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.