You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Nicholas Robinson. I want to book a flight ticket to DC- IAD.

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, my departure and return day is from 09/05 to 09/07.

ASSISTANT: Could you please give some basic details like origin port?

USER: My origin code is CLT.

ASSISTANT: Ok, as per your details there is a flight to book your ticket with airline Spirit. Shall I proceed?

USER: Yes, please complete my ticket booking.

ASSISTANT: Your ticket has been booked with flight number 1004. Have a nice journey.

USER: Thank you.

ASSISTANT: It's my pleasure.