事前 じぜん予約 よやく不要 ふようであれば
jizen'yoyaku fuyōdeareba

Noun
Da Copula
na-Adjective
no-Adjective

The "-eba" conditional form ("if/when…") of 事前予約不要

1. If no prior reservation is needed.; If a prior reservation isn't necessary.

Ba Conditional