それでは
それでは · soredeha · JLPT N5 · conjunction
well then...
それ + では = that + in that case: well then, if that is so...
それ means that, and では is で (in, given) plus topic は, read wa. Together: given that, then... Used to move a conversation along or wrap up. Casual speech shortens it to それじゃ or just じゃ, as in じゃ、また.