WordPress: optimize a search filter and some litle changes

Requirements: We use a booking plugin and there're 4 filters for search an appointment, now the task is to delete one of the filters and optimize the search if nothing selected then all appointments should be displayed. The next task is a calculation rule during the booking, the price for the appointment should change in case of booking more than 3 days 7 days 1month and 3 month. That's it Skill requirements: good knowledge of Wordpress and PHP/mySQL it's an urgent project so pls. don't bid if you haven't got enough time. If you have questions pls. don't hesitate to ask, i'll provide all the infos u need. Project rules: 1- Payment would be escrowed fully at the begin, after finishing the whole project i'll release pls. dont ask during your work for release 2- a testserver would be provide 3- The given and accepted time is the dateline if the candidate couldn't do the job in this time and don't inform me in-time the job would be cancel 4- i would be informed frequently about the progress 5- It's not allowed publishing this work in private portfolio or elsewhere and sharing this 6- All parts of programming should be commented and a little tutorial/documentation should be written afterwards