Is there a conjunctive that's roughly equivalent to "in that case" or "if so"?

Question

Say for example I want to say something like

レストランに行きたいですか？行きたかったら、私は予約をしておきますよ。

It feels cumbersome to me to have to repeat the verb 行くin the second sentence. Is there a conjunctive that I should use to replace the phrase いきたかったら? Does 場合は carry a similar connotation? Or is it just normal in Japanese to just repeat the verb here?

Answer 1

"In that case" / "if so":

• なら (colloquial)
• だったら (colloquial)
• でしたら (politely colloquial)
• であれば (formal, bookish)

Much like だから or でも which you may know, the conjugated forms of the copula だ can function as independent conjunctions (not conjunctive particles) at the beginning of a sentence, referring to the context before. It may sound surprising, but this is perfectly grammatical. The politeness or other nuances all conform to normal grammar that you need to adjust to.

レストランに行きたいですか？なら、予約しておきますよ。