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

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

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

ASSISTANT: Sure. Please share your travelling dates.

USER: Sure, I would like to go on 12/06 and return back on 12/08.

ASSISTANT: May I know your nearby 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 connecting flight available with Frontier airline, shall I book it?

USER: Ok, please proceed for further.

ASSISTANT: Your booking is done with flight number 1004. Happy journey.

USER: Thank you.

ASSISTANT: Welcome. Thank you for reaching us.

USER: Welcome.