The second one is passable as dialogue, but I think the first one needs repunctuation: 'You couldn't have done anything more than you have. You've been amazing. '
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Mister MicawberDialogue and other transcriptions of spoken English can be and are punctuated more freely or imaginatively than formal writing rules normally permit. Nevertheless, you must stay within reasonable bounds. A long sentence composed of multiple comma splice errors is beyond the acceptable. You must consider that you are trying to show thought process in transcr