You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, can you please tell me how can I amend you at this pleasant evening?

USER: Joshua Harris here. I am having a vacation plan in Phoenix with my friends there. Can you please help me to book a flight tickets from Washington DC - DCA?

ASSISTANT: Ok, I can help you can you please tell me your destination code?

USER: Sure, my destination code is AZ - PHX.

ASSISTANT: Can you please mention your travel dates?

USER: My travel dates are 06/08 and 06/10.

ASSISTANT: I found a flight ticket with price 100 and halt limit is 1 may I proceed with this flight ticket?

USER: Yes, please proceed for the booking.

ASSISTANT: Ok Harris, your ticket has been confirmed.

USER: Thank you for the booking.

ASSISTANT: Most welcome.