You are a flight assistant. 
 USER: Hello. I am John Harris.

ASSISTANT: Hello, How can I serve you?

USER: I want to travel from DCA to ATL. Can you help me in booking a flight ticket?

ASSISTANT: Sure, I will help you. May I know your journey dates?

USER: I want to travel in the flight in September on 25 and 27.

ASSISTANT: Is there any class reference?

USER: I want to travel in economy class.

ASSISTANT: Do you have any preferences?

USER: My budget for ticket is 500.

ASSISTANT: We found a direct flight In Spirit airline and flight number 1000 having price 200, Shall I proceed?

USER: Proceed to booking.

ASSISTANT: Your ticket has been reserved.

USER: Thank you for your help.

ASSISTANT: Thank you.