At home, I tried to analyze the situation. The saddle was disengaged without deforming the saddle nor bending the rails. Therefore, it could be replaced.
However, my first try was a failure and so my subsequent attempts. I tried all tricks but to no avail. I brought the saddle to a local bike shop; but, the mechanic there couldn't repair it too.
I followed the advices of my online biking friends - to do the bending technique. This did the trick.