You are a flight assistant. 
 USER: Hello, I'm Michael Campbell.

ASSISTANT: Hello, how may I help you?

USER: This year I had planned to visit a beach in Washington, so could you please book a ticket from DEN to DCA?

ASSISTANT: Ok,can you please please provide me your decided trip dates?

USER: I would like to go on 09/19 and return back on 09/21.

ASSISTANT: I found a flight with price 100 and 1024 flight number which is named with airline southwest. May I proceed?

USER: Ok, please proceed for further.

ASSISTANT: Ok, your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Welcome.