You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you aid me in booking a flight ticket from IAD to PHL?

ASSISTANT: May I know on what dates would you like to travel?

USER: I would like to go on Dec 23rd and return back on Dec 25th.

ASSISTANT: Do you require any stopovers in your journey?

USER: Ensure it is a single connecting flight.

ASSISTANT: Do you have any other requirements?

USER: Ensure the return time is in the afternoon.

ASSISTANT: UA airlines providing a connected flight in economy class.

USER: Ok, please proceed for further.

ASSISTANT: May I know your name?

USER: Myself Andrew Hill.

ASSISTANT: Your booking is done.

USER: Thank you for booking.

ASSISTANT: Thank you.

USER: Welcome.