Easy. Going like this:
Dear John (Smith):如果你和这位先生比较熟的话,Smith就可以省略,便条不必很正式.
LI Hua will pick you up 9:00AM tomorrow morning at your hotel to have business talk with PKK, and in the afternoon to look see their（这条生产线是PKK的吧.是,就保留their） new line.
*** （留条者姓名,如果你就是李华的话,前面LI Hua 就写“ I ”）
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