You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: I am planning to  visit Tilden Regional Park in Oakland with my friends on 08/22. Can you please help me for booking the flight ticket?

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

USER: Sure, the source code is from PA-PHL and the destination is CA-OAK.

ASSISTANT: May I know your return date?

USER: The return date is 08/24.

ASSISTANT: Can you please help me with your name along with your price limit?

USER: Sure, my name is Gregory Brown and the price should not be more than 500.

ASSISTANT: Thank you for your details. A flight with price 200 having single connection is found in Southwest airline.

USER: Yes, proceed with my booking.

ASSISTANT: Your ticket is confirmed in flight number 1008.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.