The impossible teenager conversation

I am having the hardest time having a normal conversation with my teenage daughter. We just seem to get no where when we try and have a conversation. This usually happens when she is asking me for help and I am trying to giver her help. Arrrgggg! It's so frustrating. I just want to be able to communicate without have a argument come out of it. Not all our conversations end up like this but I tell you most of them do. She is a very sweet and considerate person when she is talking to anyone else but me. :o( Makes me sad.