returning a string value from sqlserver procedure

I have a msaccess report that fires off a stored procedure as the code below shows
what i have is that the procedure fires asks for a start date and end date, then these values are used to build another table that I use for my report. But I require these dates to display on the report so I need to return the vaues for example   return @startdate + '  to ' + @finishdate or create a varable and build this string then return the string so that I can place it on the report. then how do I access the value to place it on the top of the report that was used to find the data..
But every time I try it keeps compaining about the fact that it cannot return an int value. the code below is were I have left it, have tried various string configurations but to no avail declare string return string ect
should be easy for a sql guru
thanks for you help in advance
*********************************************************
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[AppendToAcademicProgressRptBoth]
      @StartDate smalldatetime,
      @FinishDate smalldatetime
AS
SET NOCOUNT ON;
BEGIN
Declare @return_value varchar(20)
DELETE from AcademicProgressRptBoth
where ID > 0

INSERT INTO AcademicProgressRptBoth ( StudCourseID, Status, ModuleID )
SELECT     dbo.StudentCourse.StudCourseID AS Expr2, dbo.StudentModules.Status, dbo.StudentModules.ModuleID
FROM         dbo.StudentModules INNER JOIN
                     dbo.StudentCourse ON dbo.StudentModules.StudCourseID = dbo.StudentCourse.StudCourseID
WHERE    
 dbo.StudentModules.DateComplete >= @StartDate and  dbo.StudentModules.DateComplete <= @FinishDate

return @startdate + ' to ' + @finishdate
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