Had a similar situation one time -- my daughter hadn't ridden the bike in a while (2001 Honda CB250 Nighthawk). And she took off for work one morning, called me about noon, all in a huff. "Dang bike just quit, and I tried and tried to restart it. I even tried to roll start it. I had to walk it back home."
Later that evening, when we were both home, I asked her to go look at the fuel valve.
She sheepishly returned.
We repeated what they taught us in Beginner Riders' Course: FINE-C
Fuel, Ignition (key), Neutral, Engine (stop switch), and for those bikes so equipped, choke.
And I certainly had my learning moment. Forgot to return the fuel valve from Reserve to ON, and sure enough, I ran out of fuel just off the interstate. As luck would have it, I only had to push 100 yards or so to go over a hill, then get on the bike and glide. To top it off, while I was pushing, I picked up a police escort who turned his lights and followed me on the shoulder right to the pumps, then was off with a wave and a smile.