Resignation letter?

let me know what ypu think. if i need to tweak anything....      I am very honored to be working for (company) and I have learned great skills in the time I have spent here. I much appreciate all of the support and opportunities (company) has given me, However I regret to inform you that I resign from (company) as a (cashier). I understand that two weeks notice is standard but under "Policy 221 Seperations" I am not required to since I have not completed my Introductory Period of 90 days. I have been offered another job of employment and regrettably cannot complete 2 more weeks of employment with (company). It has been a pleasurable learning experience working as part as a team and I wish you and (company) the best success in the future.