Trip zero

A programmer.. several years ago, he came up with an application that enables him to go back in time and keep up with events that actually happened. For example, we see him taking a trip to meet Naguib Mahfouz, and accompanying us on another trip to see Cinderella, and a third, and a fourth, and a fifth.. His life was somewhat calm, until it fell between... In his hands is a brief message from an unknown person, stating that its owner wants to commit suicide, without revealing his identity, or even any information indicating his motives, so that our hero accompanies us on a journey. Another one, but more strange this time.