Greetings I

O-hayou gozaimasu
good morning

konnichi wa
hello

konban wa
good evening

yaa
hei

Youkoso irasshai mashita.
Welcome! (to greet someone)

How are you?
Ogenki desuka?

I'm fine, thanks!
Watashi wa genki desu. Arigato!

And you?
Anatawa?

Genki desu. / maa-maa desu.
Good/ So-So.

Thank you (very much)!
Arigatou!

Dou itashi mashite.
You're welcome! (for "thank you")

Samishi katta desu.
I missed you so much!

Saikin dou desuka?
What's new?

Kawari nai desu.
Nothing much

Oyasumi nasai.
Good night!

Mata atode aimashou!
See you later!

Sayonara!
Good bye!