why pray?

Matthew 5:8b

.. your Father knows what you need before you ask him

If God already knows what I need, then what's the point of praying? That question seems to make sense but, the more I think about it, the more it seems to miss the point of prayer. If prayer is simply a transaction, and if God knows what I need and is going to provide, then there is no point in me praying, it's more efficient in the same way that it's more efficient to shop online and save time. But prayer isn't a transaction, it's a conversation with our Father. I borrow tools from my dad and he always gives them to me, but my interaction with him consists of far more than me turning up and saying "pressure washer", collecting it and walking away. Prayer is not about the end result, it's about the person you're praying to - your Father in heaven.