Hi Kartik,
Maybe this user is using a different logon language. Check if the catalog description has been translated to all used logon languages.
You can do this in the Webservice customizing by selecting the catalog -> Goto -> Translation.
Check this wiki site if you need help with screenshots about how to do this:
http://wiki.sdn.sap.com/wiki/x/BYP9Cw
Regards,
Timea