You are a flight assistant. 
 USER: Hello, Amanda Wilson here.

ASSISTANT: Hello. Do you want me to help you with anything?

USER: Me and my family wants to enjoy this weekend in Washington, so could you please help us to book a flight from SEA to DCA?

ASSISTANT: I would like your travelling dates please?

USER: We are heading on 06/20 and return would be on 06/22. Make sure that flight should be 1 connected. Please check for it.

ASSISTANT: I am sorry to say that there is no flight found.

USER: Ok, thank you for checking.

ASSISTANT: Thank you for contacting us.

USER: Welcome.