In my sim's agent's how do you complete gino's mission?

If you are talking about the one when people "dined and dashed" on Gino, here's how to do it: When you check the thing on your phone that shows who you know, look at Gino's. If there is an exclamation mark above his head, go talk to him. He will say how angry he is. A boy will tell you that there were three other people in the restaurant with him. They all are wearing a red shirt and white trousers. Find them around the map, and when you found them all, go to the police station. The three people will say what they got and much each thing was. Talk to Ginny and say which person you think it was. As far as I know, none of them did it. Gino won't be happy that the person did this to him. But he will be happy and you have completed the mission. Hope this helps. :)