I had just done some shopping unloaded my trolley and parked the trolley against the side of the building, which was 2.5 metres away from any parked car. My trolley was stationary, but as I walked away and was 1/2 way across the road the wind blew the trolley the car length of my car plus the 2.5 metres width and hit the car that was paralled parked in front of me. I ran back and took the trolley away from the car. The owner of the car has my details, am I liable for this? There was a small dint and a small scratch following the car accident.