You are a flight assistant. 
 USER: HI, Justin Walker here.

ASSISTANT: Hello, how may I help you?

USER: I need to book a flight ticket from DCA to IAD to enjoy film festivals. Can you help me with that?

ASSISTANT: Sure, please share your journey dates?

USER: Sure, my arrival and departure dates are 7 Feb and 5 Feb.

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

USER: I need a direct fight.

ASSISTANT: Sorry, no flights found on your given details.

USER: Ok, no issues. Thank you for your assistance.

ASSISTANT: Thank you for choosing us.