You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Could you please book me a ticket in business class flight?

ASSISTANT: Sure, we are gleeful to help you. When would you like to make your journey?

USER: Thank you. I would start on June 22 and return on 24.

ASSISTANT: May I know your source and destination airport codes?

USER: I am heading to AUS from DFW to join the private moon walk tour with my colleagues.

ASSISTANT: Do you prefer connecting or direct flight in your journey?

USER: I am fine with any connection.

ASSISTANT: Is there any more preferences?

USER:  No.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure.

ASSISTANT: We are glad to inform you that, we found a direct flight with Southwest airlines, price is 500 in business class. Shall I proceed?

USER: Fine, please proceed.

ASSISTANT: Your ticket has been reserved with 1025 flight number.

USER: Thanks for your support.

ASSISTANT: Thank you for choosing us. May I know your name please?

USER: I am Christopher Roberts.

ASSISTANT: Have a safe journey.