You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Patrick King, can you please help me to book a flight ticket to have a round trip in Washington, DC - IAD?

ASSISTANT: Sure, can I know the travel dates please?

USER: Sure, my travel dates are 08/16 and 08/18.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: There is a flight in Delta airline with price 200, can I book it?

USER: You may proceed with my booking.

ASSISTANT: Your ticket has been booked with flight number 1001.

USER: Thank you for booking my flight ticket with Delta airlines.

ASSISTANT: Thank you for approaching us.