A Lil help on JP Phrases..

[decswxaqz]

Nicely said. Isn't it y instead of j in sayounara? Maybe is you become friendly with them you could use "matane" as "see you later" but sayounara would be better.

Here is my list to add to Sweetness'

sumimasen - I'm sorry
ohayoo gozaimasu - Good morning. Sometimes shortened to just ohayoo
konbanwa - Good evening.
konnichiwa - Hello
doozo yoroshiku - Please to meet you