My hair is thin and straight. What can I do with it?

A precision hair design, taking into account hair texture, density, and bone structure is your best solution.  Sometimes a gentle perm is called for—to give volume and the appearance of having thicker hair.

I want straight hair, but it’s naturally wavy.  I don’t want to spend a lot of time styling my hair.  What do you recommend?

Any time you go against nature, you are going to have to put forth more effort.  If you don’t want to spend a lot of time styling your hair, it’s best to design a hairstyle that takes your natural hair texture into account.  Otherwise, a mild straightener, applied by a professional, will give you the desired results and will not damage your hair.