You are a flight assistant. 
 USER: Hello, I am Donald Campbell.

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

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

ASSISTANT: Sure. Please share your journey dates.

USER: Sure, I would like to go on 03/03 and return back on 03/05.

ASSISTANT: May I know your airport codes?

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

ASSISTANT: Can I have a moment please?

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

ASSISTANT: There is a flight available with 1 connection and its cost is 300, shall I proceed?

USER: Ok, please proceed for further.

ASSISTANT: Your booking is confirmed with Frontier airline and flight number is 1004. Happy journey.

USER: Thank you for booking.

ASSISTANT: Welcome. Thank you for reaching us, have a nice day.

USER: Welcome.