You can say 有難うございます、良く手伝いました (arigatougozaimasu, yoku tetsudaimashita), "Thanks, you've been a real help".
Further, you may say 手伝ってくれて有難うございます 'tetsudatte kurete, arigatou gozaimasu.' Or, if someone has been looking out for you/particularly kind, you may say お世話になりました 'Osewa ni narimashita.'
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'Tasukete kudasai' (Help me, I'm in danger) or 'Tetsudatte kudasai' (Help me [with this task])
"私を手伝ってくれますか" /wa ta shi o tet su dat te ku re ma su ka/ read consecutively: 'watashi o tetsdatte kuremaska' is a way of saying 'Will/Can you help me please?' in polite Japanese.