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

ASSISTANT: Hello, how may I support you at present?

USER: I have planned to go for Science festival at Oakland, CA - OAK. Can you please make a plane reservation on 08/15?

ASSISTANT: Sure, kindly please mention your return date.

USER: I want to return on 08/17.

ASSISTANT: Ok, please share your boarding point.

USER: My boarding airport is Philadelphia, PA - PHL.

ASSISTANT: Ok, Can you please mention your budget?

USER: I can spend up to 500.

ASSISTANT: Thanks for your information, we found a flight in 1022 Southwest airline with a fare of 200.

USER: Ok, please proceed for booking.

ASSISTANT: Sure, your booking has been done.

USER: Thank you.

ASSISTANT: Thank you for availing us.