how can extract data from txt file?

I am trying to read a specific name from the text file which correspond to mseconds( for example Jim and John occurances) and depends of the timing correspond to the name I would like to extract an audio signal but only the specified mseconds which are read from the txt file.

my current code:

filename= 'test.txt';

[y, Fs]= audioread(filename);

cutData= y(((Fs*(652-1))+1:Fs*(767-1)/2-10,:);

plot(linspace(0.652,0.767,length(cutData)),cutData);