This is my first time hosting and my guests are suppose to arrive today. We have messaged each other several times over the past few weeks and he has great reviews as a guest from several different people. I googled him and he seems to be a real person.
The issue now is that I have messaged him yesterday and today (today being the arrival day) and he has not messaged me back. Has this happened to anyone else before?
Yes, especially if they are traveling from far way. If you have a tentative time for his arrival, start worrying when he's more than 8 hours late and still has not communicated. Until then, it's really pretty normal.