DearTom,
I'mverysorrythatIcan'tgoonatriptoBeijingwithyounextweekend,whichIhavepromisedyou.I'mwritingtotellyouthereasonforit.(topic)
Justnow,mycousin,LiMing,whowentabroadforfurthereducationlastyear,informedmethathewouldreturnthenextSaturdaymorning.Heaskedmetopickhimupattheairportwithhisparents.Asyouknow,wehaven'tseeneachotherforaboutayear,soI'llhavetohelphiminthefirstplace.
Ireallyhopethatyoucanacceptmyapologiesandunderstandme.IwouldappreciateitifyouallowmetofixanothertimetoshowyouaroundsomeplacesofinterestinBeijing.
Wishyouhaveagoodtimethisweekend!
Yours,