Three year old wont eat dinner.

Hi all.. I have a 3 year old who is pushing all the buttons and will not eat dinner 5 out of 7 nights. He is in a healthy weight range and does not overeat during the day. It has been happening for the last month my husband and i are at our wits end!! Could any of you wonderful Mums share some of your tips that you have had success with when having eating issues?