'Itsuka mata aimasu ka?'.
再び
mou ichido itte kudasai.
As in 'see you later?' You may say 'jaa, [mata] ne.'
Japanese would say sashiburi
see Google Translate
Miru koto wa dekimasen
Yurei wo Miteita!
You may say 'Eiko ni aitai.'
ja ne mata ne
urigami nakoruto hertforumenas
'Ima watashi wa mieru'.
when am I going to see you again = Cuándo voy a verte de nuevo