In Japanese culture, saying sayounara arigatou gozaimasu is a way to express gratitude and farewell at the same time, acknowledging the kindness or assistance received from others. While it may seem like two separate phrases, they are deeply connected in Japanese etiquette, with 'sayounara' meaning 'goodbye' and 'arigatou' meaning 'thank you.' The addition of 'gozaimasu' is a polite way to show respect and appreciation for the person's help or support. Using this phrase can be a meaningful way to thank someone in Japan, especially when parting ways, but also acknowledges their contribution to one's well-being.