DOS Batch - Problems with my code in batch file (find and replace the value of variable)

--------------------------------------------------------------------------------

hi
i wrote one batch file.that batch file will take input from the user and replace the value with existing value

myBatchFile.bat
------------------------------------------------
@echo off
set /p _name=Enter your name:
echo Hello %_name%!.
SET Filename=shell.rsp
set FROM_LOCATION1=FROM_LOCATION="%_name%"
echo %FROM_LOCATION1%
setlocal enabledelayedexpansion
for /f "tokens=* delims=" %%i in (%Filename%) do (
set input=%%i
set input=!input:FROM_LOCATION=%FROM_LOCATION1%!
echo !input! >> %Filename%.chg
)
ren %Filename% %Filename%.old
ren %Filename%.chg %Filename%
del %Filename%.old
--------------------------------------------------------------------
shell.rsp
***************************************
#-----------------------------------------------------------------------------
# Name : FROM_LOCATION
# Datatype : String
# Description : Complete path of the products.xml file from the staging area
# where you untared your patch set.
# Valid values : Full path ending in "products.xml"
# Example value : "/patchset/oracle10g/stage/products.xml"
# Default value : "../stage/products.xml"
# Mandatory : Yes
#-----------------------------------------------------------------------------
FROM_LOCATION=<Value Required>
****************************************

i am unable to replace the value of the FROM_LOCATION varible

please help me to find the bug in my code?