Don't cry=泣かないで(nakanaide) Everything will be alright!=大丈夫だよ！(daijoubu dayo)←this is difficult ;^^

Well, Hikaru did gave you a good answer, but I would say this: Don't cry. ( Nakanaide) Everything will be all right. ( なんとかなるよ）　Nantoka Naruyo It means, "Just let it flow and let's see."