My 4 year old kid repeatedly asking what she want till she got what is the reason how to stop this

A. Every child does it actually they are of the similar nature most of the kids till the time you do not say yes to what they want to do it it’s a normal thing because ultimately want something which you are denying and without your permission they cannot have it to get into this habit of constantly irritating you so that you just get tired and say yes so just ignore say there’s no matter how many times you ask my answer is not going to change