You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Carolyn Lee. I would like to spend my free time with my friends at Washington, can you please help me to book a flight ticket from DTW to IAD?

ASSISTANT: Yes, I can help you. Can you tell me your travelling dates?

USER: Sure, my journey dates are from 01/21 to 01/23.

ASSISTANT: Give me a moment.

USER: Ok, I will wait for your response.

ASSISTANT: I have found a flight ticket with a price of 200 and 1 connection.

USER: That's fine for me to travel, please proceed for booking.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching our agency,.