Dear HR, 

I was delighted to come across this job opening for the Office Assistant at A-One Electric & Solar Ltd. With my experience working as a shop manager and a factory supervisor, I believe I have the knowledge and drive to be among your staff. 

Becoming an Office Assistant at A-One Electric & Solar Ltd will mean much more than a job for me, it will be in me to help your office thrive and tackle any challenges that come along. 

I'd love to be among your staff, I'm the Office Assistant your company need. 

Thanks.