There could still be the possibility that the person claiming to be the time traveler is just someone who managed to hack into your computer memory. I mean if

There could still be the possibility that the person claiming to be the time traveler is just someone who managed to hack into your computer memory. I mean if this happened to me, my first thought would "who is this person and how did I got hacked?" which seems way more likely than being visited by someone from the future. Would prefer to wait for a confirmation such as telling me about what would happen on the next day.