"Sayounara （さようなら)" can be also used instead of "sayonara （さよなら)." People do not say "sayonara （さよなら）" when leaving their own home. "Ittekimasu（いってきます）" is normally used. The response to "Ittekimasu （いってきます）" is "Itterasshai （いってらっしゃい）". "Dewa mata （ではまた）" is also often used as "see you later", similar to the English expression.
How about "See you tomorrow"? "Tomorrow" is "ashita （明日）" in Japanese. I think you can guess what the the answer is: "Mata ashita （また明日）".
I hope you can practice these greetings. I am going to tell you one more phrase, "Mata raishuu（また来週）". This means "See you next week".
