Use find /replace activity to find john and then get the cell number to know the tow number
Then looks like the above are dates based on the start column and get the column name for any date you need
For example say 1 is staring from column E then use UiPath.Excel.Helpers.ExcelUtilities.ConvertColumnIndexToColumnLetter(4+requireddate)
Here say if required date is 5 you get E if it is 7 you get G and so on
Use the row and column to write the value to required cell
Hope this helps
Cheers