Nounでよければ

Usage

Xでよければ presents a condition for doing something. It is also used when the speaker politely offers something to the hearer.

この辞書でよければ、どうぞ。 If you don't mind here is the dictionary.

今日は忙しいけど、来週の日曜日でよければ、一緒に行けるよ。 Today I am busy, but next week on Sunday we can go together.