DearMr.Wong，
IwouldliketoletyouknowhowmuchIhaveenjoyedmylastthreeyearsattheHeroCompany.HeroCompanyisaninvaluableplaceforenrichingmyknowledgeaboutfinancialfield，IenjoyedworkingwithmycolleaguesandIhavelearnedsomuchthingshere.
BecauseIwouldliketotakeanewchallengeandIwanttomeetpeoplefromallwalksoflife，IhaveacceptedanofferfromanInsurancefirmasaPersonalFinancialConsultant.Iwouldthereforeappreciateitifyouwouldacceptmyresignationeffectivefrom8March，20xx.
IwouldbeverymuchobligedifyouwouldkindlygivemeareferenceletterbeforeIleave.Thankyouforallthatyouhavedonetomakemyworkherebothinterestingandenjoyable.
Yoursforever，
David