Good day sir/ madam,
My name is OKONKWO EBERECHI RUTH and I'm writing this application letter for the position of an office assistant for your organization. I came across this this offer through an online platform. I have a year experience working as an administrative officer and this was during my NYSC Programme. I am a hardworking and honest individual who has the ability to multitask and cooperate with my team members. I can also work under pressure, pay attention to details and deliver results appropriately. 
If I'm being hired for this position, I would contribute positively to the greater development of the organization while working earnestly with my colleagues and facilities to achieve organizational goals. I will also be committed an dedicated as part of the management team where my skills and abilities will be utilized effectively.  
I have attached below my resume for your review.
Thank you so much for your consideration, I really look forward to hearing from you soon.

Regards,
Ruth Okonkwo