Web development -- 3

I need my website re-configuredhello, for an existing site. there is a module where customers are allowed to choose a delivery slot for a given given code. if the products are sold out for that week, customers are still allowed to choose a slot, but then products are sold out, so they have to choose next week's slot. instead here I dont want want customer even choose a slot in that week where all products are sold out. I need someone who can fix this in my local thru team viewer. budget is 15-30 USD. need immediately done. Thank you