Recently I found out that the word Sayonara was used wrongly in the famous song from the film Love in Tokyo (1966).
Sujoy Chatterjee explained that Sayonara is used for very long or final goodbye. Definitely not used if you planning to meet the next day, as Asha Parekh says in the song.
He has explained it in this video
SAYONARA MISTAKE
Now You Know!