事前 じぜん予約 よやく不要 ふようだったら
jizen'yoyakufuyōdattara

Noun
Da Copula
na-Adjective
no-Adjective

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

1. If no advance reservation is needed.; If advance reservation weren't necessary.

Tara Conditional