declined the invitation for dinner
Dear Catherine,
It gives me the greatest pleasure to be invited by you,but I feel very sorry for not being able to have dinner with you in the evening of sunday.Due to Tony's Mom will visit us from Guangzhou,we'll go to pick her up at the train station that night.We would like to have dinner with you,but we must go to the station because of the first arrival of Tony's mother.
Thanks agian for your gracious invitation,may you have a nice wekend!
yours Mary
这种属于便条式的小作文,字数不宜过多哈.我稍稍做了一点补充,