You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I need a direct flight to attend an urgent meeting at Washington, can you please help me in booking a flight ticket on 21st Nov?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: Sure, I want to depart from PHL and land at IAD.

ASSISTANT: When will you return back?

USER: I will return back on 23rd Nov.

ASSISTANT: Do you prefer either economy or business class?

USER: I am comfortable with any class.

ASSISTANT: Please let me know if you have any other preference.

USER: I don't have any other preference.

ASSISTANT: May I know your name to proceed further?

USER: Myself, Barbara White.

ASSISTANT: We have found a direct flight from Spirit airlines number, 1014 and the price is 100. Shall I proceed with the booking?

USER: Sure, please proceed with the booking.

ASSISTANT: Your ticket has been confirmed in economy class.

USER: Thank you for helping me.

ASSISTANT: Thank you for reaching us.