Shampoo and conditioner for long hair?

I have long hair and it is normally straight. Recently the shampoo and conditioner has not been untangling my hair. Sometimes a i blow dry and others I air dry. Today does not feel like my hair is as straight and shiny today. I use Herbal essence you know the one for hair that is straight, curly, frizzy, and etc. Any suggestions on any new shampoo and conditioners I can buy?