You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Myself Jonathan Nelson here. I would like to travel from TX-DFW to DC-DCA, to attend a business meeting at Washington.

ASSISTANT: Could you please let me know your travelling dates for better purpose?

USER: My dates of trip is from 08/28 to 08/30. My connection limit is 0.

ASSISTANT: Nelson, there is no flights on your preferable dates.

USER: No problem.

ASSISTANT: Sorry for the inconvenience. Thank you for reaching us.

USER: Ok, fine. Welcome.