hotel booking system function upgrade

i got a hotel booking system as a extension under joomla and now i want a joomla expert to upgrade my hotel booking system function. you can view my source code to upgrade the functions which i required. -------------------------------------------------------------- please refer to this website: [login to view URL] as my booking engine only can set the available room under a certain date, when someone booking it will cause a problem as i can't set the available room quantity which can result some rooms actually not available. i need the function like the refer website. joomla expert and hotel booking engine expert welcome to this project. deadline --------- 15 of January. please ask me if you have any questions.