You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Carolyn Perez here.

ASSISTANT: What type of help that you need from my side?

USER: I want to attend an Agricultural meeting in Dallas that can helps to improve my agricultural techniques in my cultivation. Can you please help me for booking the flight ticket from Washington?

ASSISTANT: Sure, I am happy to help you.  Can you please let me know the dates of your trip?

USER: My departure date is 01/12 and return date is 01/14.

ASSISTANT: Ok, can you please provide me the regional airport codes?

USER: My airport codes are from DCA to DFW.

ASSISTANT: Please give me a moment.

USER: Ok, make sure my connections limit is 0.

ASSISTANT: As per your information there is no flight that is matching to your criteria to book your flight ticket. Sorry for the inconvenience.

USER: Anyway, thanks for the information.

ASSISTANT: You are most welcome.