You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Can you please search a flight ticket from IAD to DCA?

ASSISTANT: How may I help you? Please share your trip dates.

USER: My trip dates are 04/24 and 04/26.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: May I know your name?

USER: Myself Ryan Lewis.

ASSISTANT: Sorry Ryan, no flight is available on your route.

USER: Ok, fine thank you checking.

ASSISTANT: Thank you for choosing us.