You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am William Parker.

ASSISTANT: How may I assist you today?

USER: I want to travel from IAD to DFW. Can you book a flight ticket for me?

ASSISTANT: Sure, please provide me your travel dates.

USER: I want to fly in the flight on 09/02 and 09/04.

ASSISTANT: Based on your request there is a flight with airline UA and price is 200, shall I proceed with this flight to book a ticket?

USER: Book the ticket for me.

ASSISTANT: Your ticket has been booked with flight-1011.

USER: Thank you for your help.

ASSISTANT: My pleasure.