Dear Hr,
Please accept my enclosed application for the Office Assistant role at your company. Having read through your job description, I am thrilled to be applying for this position as my years of experience and skillset match the requirements you’re looking for.
At my previous places of work,  I am valued by the CEO and the staff as a critical support pillar for the team, keeping meetings, papers, training staff, and office monetary items organized at all times. I have spearheaded the effort to “go digital” for almost all planning and paperwork, increasing office efficiency to the point of savings and investments.  I have attached my CV to back up my claim and I look forward to meeting you in person to share my insights and ideas to assist in the company's goals.