You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Nicholas Robinson. I have to go New York city to give presentation over there. So please help me with flight ticket booking from Washington.

ASSISTANT: Sure Robinson, can you please provide me with your dates of journey?

USER: Thank you. I have planned to travel on dates of Sept 05 and Sept 07.

ASSISTANT: Ok, may I know your respective airports codes of travel please?

USER: Sure, I would like to travel from IAD to EWR.

ASSISTANT: Do you have any other specification please?

USER: Yes, I would like to depart in the afternoon time.

ASSISTANT: There is a flight with the connecting flight of fare 100 with Delta airline, are you ok with this booking?

USER: That is fine, please proceed with booking.

ASSISTANT: Ok, I have reserved your ticket with the flight number 1004.

USER: Most welcome.

ASSISTANT: Thank you for your service in booking.