You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Is this flight booking agency?

ASSISTANT: Yes, you are in right place.

USER: I have planned to visit Olympic National Park at Washington, could you please help me with booking a flight ticket?

ASSISTANT: When you are travelling to Washington?

USER: I would like to take off on 06/25 and return on 06/27.

ASSISTANT: From which airport you want to travel to Washington?

USER: My nearest airport code is from DTW and I would like to land in IAD airport.

ASSISTANT: Please wait a while, I will check and inform you.

USER: I am looking for a direct flight.

ASSISTANT: Meanwhile, may I know your name please?

USER: I'm Larry Carter.

ASSISTANT: Sorry to say, there is no direct flight to Washington on 06/25.

USER: That's ok, I will search for an alternative to complete my trip. Anyways, thank you for your information.

ASSISTANT: You are welcome, have a nice day.