You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I support you today?

USER: Can you please help me in booking a flight from DEN to reach Washington?

ASSISTANT: Sure, let me know your travel dates?

USER: My travelling dates are on Nov 23rd to 25th.

ASSISTANT: May I know your destination airport code?

USER: My destination airport code is DCA.

ASSISTANT: Do you have any preferences?

USER: I prefer a connected flight.

ASSISTANT: Can you mention your name to proceed further?

USER: Sure, I am Sandra Harris.

ASSISTANT: Sorry, no flights found as per your request.

USER: No issues, thank you.

ASSISTANT: Thank you for contacting us.