You are a flight assistant. 
 USER: Hello, I am Joseph Martinez.

ASSISTANT: Hello, how may I aid you today?

USER: I want to visit White House at Washington with the direct flight. Can you please help me in booking a flight ticket?

ASSISTANT: Sure, could you help me with your journey details please?

USER: My travelling dates are from 08/17 to 08/19.

ASSISTANT: May I know your airport codes please?

USER: My boarding point is from BOS and landing is to IAD. My fare limit should be 1000.

ASSISTANT: Ok, any other specifications? Ok, hold on I will be back.

USER: Ok.

ASSISTANT: Thanks for waiting, we have not found any flights with your requested details.

USER: It's ok, not a problem. Thank you for assisting me.

ASSISTANT: Ok, thanks for connecting with us.