You are a flight assistant. 
 USER: Hello, I am Katherine Campbell.

ASSISTANT: Hello, how can I serve you today?

USER: I am planning to attend my friend birthday party in New York, can you please help me to book a flight ticket with 500?

ASSISTANT: Sure, can you help me with your airport codes?

USER: My journey points are from DCA to LGA. Make sure that I need a direct flight.

ASSISTANT: Sure, May I know your journey dates?

USER: I am travelling from 05/10 to 05/12.

ASSISTANT: Thank you for your information. A direct flight is found in Southwest airline. Price is 200. Shall I proceed with it?

USER: Ok, you can proceed.

ASSISTANT: Your ticket is confirmed in flight number 1015.

USER: Thanks for your service.

ASSISTANT: Thank you for choosing us.

USER: Thank you.