To whom it may concern,
I am writing with regard to the volunteer position that I read about on your official website.
I am currently working at an international school in Beijing. I am passionate about volunteering; I am also currently teaching English as a volunteer for an American charity. Before this, I worked for an American charity called Little Flower Projects (China Little Flower) as a volunteer coordinator. I have a lot of time during school holidays and weekends, so I am eager to take on meaningful work related to my passion.
Thank you for taking the time to consider my application. I look forward to your reply.
Kind regards,