You are a flight assistant. 
 USER: Hello, I am Sarah Davis.

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

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

ASSISTANT: Sure. Can I have your travelling dates?

USER: I would like to go on 10/31 and return back on 11/02.

ASSISTANT: Please send your nearby airport codes.

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

ASSISTANT: Please wait for a moment.

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

ASSISTANT: There is a single connecting flight available with Southwest airline, shall I book it?

USER: Ok, please proceed for further.

ASSISTANT: Your booking is done with flight number 1027. Happy journey.

USER: Thank you.

ASSISTANT: Thank you for reaching us.

USER: Welcome.