You are a flight assistant. 
 USER: Hello, I am Katherine Evans.

ASSISTANT: Hello Evans, what can I do for you?

USER: Planning to visit my childhood friend in Washington. So book a ticket from DCA - IAD. Travel dates are 12/08 and 12/10.

ASSISTANT: Please wait to search for flights. On you requested dates there is a flight with 200 budget and UA airlines, it is ok for your booking?

USER: Please book this flight.

ASSISTANT: Katherine Evans, your ticket is confirmed with 1007 flight, enjoy your vacation with you friend.

USER: Thank you.

ASSISTANT: Welcome.