You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I need to attend a workshop in LAX, please book a ticket from DCA.

ASSISTANT: Sure, May I know the travelling dates?

USER: Sure, my planned departure and return travel dates are 29th Sept and 1st Oct.

ASSISTANT: Do you have any connection limit?

USER: I just need direct flight.

ASSISTANT: Is there any other requirements?

USER: No, I don't have any other specifications.

ASSISTANT: May I know your name?

USER: Yes, my name is Donna Miller.

ASSISTANT: Please wait a moment.

USER: Sure, I'll be online.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for opting us.