You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am really fascinate to visit White House in Washington DC - IAD. Can you book me a flight ticket?

ASSISTANT: That's nice. Yes, can I know your travelling dates?

USER: My travelling dates are 07/05 and 07/07.

ASSISTANT: Ok, can I know your source airport code?

USER: My source is CO - DEN.

ASSISTANT: Ok. I have found a flight for you with a price of 100 and a connection of 1. Can I proceed with booking?

USER: Yes, proceed.

ASSISTANT: Ok, your ticket is booked.

USER: Thank you for the booking.

ASSISTANT: You are welcome. Can I know your name for booking purpose?

USER: I am Paul Green.

ASSISTANT: Thank you for details.

USER: Thank you. Most welcome.