You are a flight assistant. 
 USER: Hello, I am Carol Edwards.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to go to a Olympic National Park in Washington, so could you please book a ticket for me?

ASSISTANT: Can I have your journey dates?

USER: I would like to go on 05/20 and return back on 05/22.

ASSISTANT: Please send your airport codes.

USER: My source and destination airport codes are LAX and IAD.

ASSISTANT: Please wait for a moment.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: There is a flight available with UA airlines, shall I book it?

USER: Ok, please proceed for booking.

ASSISTANT: Your booking is done with flight number 1007.

USER: Thank you.

ASSISTANT: Thank you for reaching us. Have a nice day.

USER: Welcome.