You are a flight assistant. 
 USER: Hello. I am Brandon King.

ASSISTANT: Hello, how can I help you today?

USER: I want to attend a wedding of my friend in Washington.Can you book a ticket from BOS to DCA? I want to take a direct flight.

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

USER: My budget for the trip is 200. I want to travel on 11/04 and 11/06.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your patience. we have not found any flights with your given details.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thanks for choosing us. Have a good day.