You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I Help you today? Can you please provide your travelling dates and airport abbreviates?

USER: I am Larry Hall, I want to go to Festival celebrations,so please help me for booking a flight ticket. My departure day is Oct/14, return day is Oct/16.

ASSISTANT: Can you send the Abbreviates of airpport?

USER: And my source and destinations are DC-DCA, FL-MCO.

ASSISTANT: Wait a minute.

USER: OK sure.

ASSISTANT: Sorry to tell that there is no flight found.

USER: OK, thank you for your service.

ASSISTANT: Thank you have a great day.