You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to book a flight ticket from ORD to DCA. Could you help me in booking?

ASSISTANT: Sure, can you please provide your journey dates?

USER: My travelling dates are from Apr 26 - 28.

ASSISTANT: Are you looking for any preferred connections?

USER: I prefer for direct flight.

ASSISTANT: Do you have any other specifications to be met?

USER: No.

ASSISTANT: Can I have your name to proceed further?

USER: James Martinez.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.