Sir/Mam,
As a fresher, I believe that though I have no work experience, If you should hire me because of my passion for my work, I'm very hardworking person and always hungry to learn new things.
If you giving me this golden opportunity to work with you, I promise you that your decision for selecting me will not be wrong. If my skills are not enough for the task given to me, I'll take guidance from my expertise of the company and work to the full extent in growth of my personal as well as the company growth.