【How-to】What is sumanai - Howto.org

The standard reply is “どう致しまして”(dou itashimasite), a formal way to reply to “arigatou gozaimasu” or “ doumo arigatou gozaimashita.” I often hear Japanese people say どうもどうも(doumo doumo), a very convenient phrase which can means many things such as : hello, thank you, never mind, your welcome, good bye, etc.