Onepossibleversion:
DearHeadmaster,
I'mwritingthislettersimplytotellyousomethingaboutthecanteenserviceinourschool.I'mtheministerfromthelifedepartmentoftheStudents'Union.
Ingeneral,theserviceissatisfactory.Thedisheslookinvitingandtastedeliciousaswell.ThepriceofthemealsisOKforusandthevarietyofdisheschangeseveryweek.What'smore,theworkerstheretreatusastheirfriends,whichmakesusfeelveryhappy.
However,weoftenhavetostandinlineforalongtimebeforewecangetthemeal.Youcouldunderstandhowprecioustimeistousstudents.Therefore,mayIsuggestsomethingbedonetosolvetheproblemssuchasthedishqualityandsurroundingssothatwecanallenjoyourmealsatschool?
Thanksforyourconsideration.
Sincerelyyours,