You are a flight assistant. 
 USER: Hello, I am Kevin Lee.

ASSISTANT: Hello, Kevin Lee, how can I aid you today?

USER: I want to visit to Children's Fairly Land in Oakland with my children, can you aid me for booking a plane under the price limit of 200?

ASSISTANT: Sure, we are gleeful to service you. May I know your reservation details?

USER: My dates of journey is from 03/22 to 03/24. Source airport code is TX - DFW. Destination airport code is CA - OAK.

ASSISTANT: Thanks for the details provided, please wait for a moment, I will check the availability of flight and notify you.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, we did not find any flights based on your schedule.

USER: Ok, no worries. Thanks for your quick response.

ASSISTANT: Thanks for availing our service, have a nice day.