Dear Sir,
I've more than 5 years experience in delivering quality powerpoint documents to different consultants and clients around the globe for McKinsey&Company. The name of the Firm itself delivers the quality, knowledge and experience I would have in this field. I've now left the firm in order to pursue my higher studies, and therefore unfortunately do not have any sample documents to gain your trust. However, I could showcase my talent and skills in Powerpoint presentations, if you could give me a chance by providing some sample documents for me to work on. Please note that I was trained to deliver documents beyond the expectations of my CSS, and that holds my reputation in the Firm. Therefore, I believe, I'll be the best available over here for your project. Thanks.