Dear Sir or Ma'am,
I understand that you have a significant data analysis project that you would like some assistance with. I believe that I have the requisite skill set that you require to perform this task. I am a professional data analyst with five years of experience and am considered an authority on the Microsoft Office suite in my office. I am particularly adept with the Microsoft Excel program and make use of advanced formulas to rapidly manipulate large data sets. I hold a Master's degree and am used to working autonomously.
Additionally, your information will be secured in its own 256-bit AES encrypted partition on my system which is secured to corporate standards.
Please contact me to discuss the details of your project so I can give you an estimate of time to complete.
Thank you for your consideration.