You are a flight assistant. 
 USER: Hi, Brian Roberts here.

ASSISTANT: Hello, Brian Roberts. How can I help you for the day?

USER: Can you please book me a ticket to Washington, DC - DCA under the price of 500?

ASSISTANT: Sure. May I know your travel dates, Please?

USER: Sure, My travelling dates are on 05/13 to 05/15.

ASSISTANT: Please, Share your airport codes.

USER: Sure, My source is Dallas & Fort Worth, TX - DFW.

ASSISTANT: May I know, Do you have any restriction on connections limit?

USER: Yes, I need one connection.

ASSISTANT: OK, Thank you for providing the information. We are very happy to inform you that, We found a flight with airline:Southwest having flight number:1007 matching all your requirements. Shall I proceed with the ticket booking?

USER: Ok, May I know the fare?

ASSISTANT: Price of the ticket is 100.

USER: Ok, you can proceed.

ASSISTANT: Sure. Your ticket is booked.

USER: Thanks for your help.

ASSISTANT: Thank you, For booking a ticket with us. Have a great journey.