You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how could I aid you?

USER: I want to attend a Seminar in Washington. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, can I know when you are willing to travel?

USER: My travelling dates are Dec 19 and Dec 21.

ASSISTANT: Please provide your specifications?

USER: I prefer single connecting flight.

ASSISTANT: Will you please let me know your boarding and landing point?

USER: My airport codes are SEA and IAD.

ASSISTANT: May I know your name please?

USER: My name is David Martin.

ASSISTANT: We found an American airline of flight 1001 in an economy class with single connection. Can I proceed with the booking?

USER: Please proceed for booking the flight ticket.

ASSISTANT: Your ticket has been confirmed.

USER: Thanks for helping me.

ASSISTANT: Thank you.