Anupama,
Think for just a moment about what you are asking. A Web Service has no idea about the context in which pages are being served to users. There is no relationship between a Web Service call and a session.
Now you could write a Web Service that stored a specific URL to a configuration file then when a client requests a specific page, that URL could be read from the config file.
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Bob Mixon
http://www.sharepointblogs.com/bmixon