So far, we have prepared two different lists where one list has the installers (Name and Date) and the second list has the sessions (Page and Date). As you can derive, the date will be the key to matching corresponding names to the pages.
After you have prepared these lists in different tabs on Microsoft Excel or Google Spreadsheet, open a third tab where you will be able to match them with the formula. Since it is expected to have some time between the page visit and install time, we need to find the closest ones. Therefore, using VLOOKUP or EQUALS formulas will mostly fail. The best alternative way is using MATCH/INDEX formulas together.
The first column of the third tab (calculation) should be the list of the installers. The second column should have the MATCH/INDEX formula with ArrayFormula.
Here is the formula you need: