LuisMars

ConvEx is a tool that helps you extract conversations out of the /condump generated file.
Windows users, put the files on the same directory, edit the .bat file to match your input file and choose one to be your output, after that add all the names you want all between quotation marks.
You can also use with the console in Linux and Mac.
 
java -jar convex.jar "input.txt" "output.txt" "Player1 name" "Player2 name" "Player3"
 
 
You will need java.