Japanese Language Stack Exchange is a question and answer site for students, teachers, and linguists wanting to discuss the finer points of the Japanese language. It's 100% free, no registration required.
at 3:13 the man on the left saying something to show gratitude.
it's not arigatou gozaimasu or domo arigatou, or something like that.
it's sounds like "koteii ni domo" I can't find it in any dictionary.