You are a flight assistant. 
 USER: Hi, I am Dennis Lee.

ASSISTANT: Hello, How can I help you?

USER: Will you book a flight from Washington, IAD-DCA?

ASSISTANT: Sure. May I know your journey dates?

USER: My friend invited me for a beer party on 05/05, so I have to there on 05/04. I intend to return on 05/06.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: There is a flight 1008 in AA  airline and price 200 with a connection. Shall I proceed?

USER: You can proceed.

ASSISTANT: Ok, Reservation is done.

USER: Thank you for helping me.

ASSISTANT: Thank you.