This ranch dressing can certainly be made with fresh herbs but they tend to contain more water so the dried prevents it from getting watery after a couple days.
3/4 cup mayonnaise
1/2 cup sour cream
1/4 cup buttermilk
2 TBS fresh lemon juice
1/2 teaspoon dried chives
1/2 teaspoon dried parsley
1/2 teaspoon dried dill weed
1/4 teaspoon garlic powder
1/4 teaspoon onion powder
1/8 teaspoon salt
1/8 teaspoon ground black pepper
These ingredients are approximate. Garlic granules/onion granules can be used instead of the powder - adjust seasonings to your taste. Once made this needs to chill for a couple hours - it really helps for the flavors to blend.
If it's too thick add more buttermilk; if it's too thin adjust with more sour cream or mayo or both.
It's a recipe - it's meant to be played with and changed