You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Justin Lee here.

ASSISTANT: How may I assist you at this moment?

USER: I would like to visit Washington to meet my brother, please help me in booking a ticket from DTW to IAD.

ASSISTANT: Sure, I am here to help you but I need your period of journey to search best flight for you.

USER: My journey dates are 03/18 and 03/20.

ASSISTANT: I found a flight with airline AA and price 100. Shall I proceed?

USER: Ok, please proceed with my booking.

ASSISTANT: Your ticket has been booked with flight-1008.

USER: Thank you for your help.

ASSISTANT: My pleasure, have a safe journey.