You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I am Brain Brown. I am looking for a flight from DEN to IAD, can you please help me?

ASSISTANT: When are you planning to make your journey?

USER: Sure, my desired dates are 09/19 and 09/21.

ASSISTANT: We have found a connected flight with Southwest airlines, flight number 1020 and the fare of 200.

USER: Ok, please book.

ASSISTANT: Your booking is done.

USER: Thank you for your help.

ASSISTANT: Your welcome.