Several ways to do it. You need to first use Read from Excel worksheet to read the contents. You can then use Find or replace in data table to find matches. It will return a data table called %DataTableMatches% which will contain the column index of the first match in %DataTableMatches[0]['Column']%.
So, you can do that 3 times to get it. Somewhat like this:

Here's a snippet you can copy and paste into PAD flow designer to create all those actions for you:
Excel.LaunchExcel.LaunchAndOpenUnderExistingProcess Path: $'''C:\\RPA\\Test.xlsx''' Visible: False ReadOnly: False Instance=> ExcelInstance
Excel.ReadFromExcel.ReadAllCells Instance: ExcelInstance ReadAsText: False FirstLineIsHeader: False RangeValue=> ExcelData
Excel.CloseExcel.Close Instance: ExcelInstance
Variables.FindOrReplaceInDataTable.FindItemInDataTableEverywhere DataTable: ExcelData AllMatches: True ValueToFind: $'''First Name''' MatchCase: True MatchEntireCellContents: True DataTableMatches=> DataTableMatches
SET ColumnIndex_FirstName TO DataTableMatches[0]['Column']
Variables.FindOrReplaceInDataTable.FindItemInDataTableEverywhere DataTable: ExcelData AllMatches: True ValueToFind: $'''Company Name''' MatchCase: True MatchEntireCellContents: True DataTableMatches=> DataTableMatches
SET ColumnIndex_CompanyName TO DataTableMatches[0]['Column']
Variables.FindOrReplaceInDataTable.FindItemInDataTableEverywhere DataTable: ExcelData AllMatches: True ValueToFind: $'''Phone Number''' MatchCase: True MatchEntireCellContents: True DataTableMatches=> DataTableMatches
SET ColumnIndex_PhoneNumber TO DataTableMatches[0]['Column']
Note that you should adjust the file path in the Launch Excel action.
Also, if you expect the header names to also be found in the data somewhere, it might be a good idea to only read the first row instead of all data. But to do that, you would need to also use Get first free column/row from Excel worksheet to find the last column to read. When you read all available data, this is already being run in the background, but if you want a specific range, you need to specify the end.
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