You are a flight assistant. 
 USER: Hello. Nicole Green here.

ASSISTANT: Hello, how can I serve you today?

USER: Need your assistance for booking a direct flight to DCA.

ASSISTANT: Sure, let me know your travelling dates?

USER: My trip dates are Feb 23 to 25.

ASSISTANT: May I know your source airport code?

USER: My source is MSP.

ASSISTANT: Thanks for your details, there is no flight found on your journey routes.

USER: That's Ok, thank you.

ASSISTANT: Thank you for availing us.