Hi Sharath,
If your Virtual Service is created correctly, your request should already have an argument created for this parameter (by default it is named URLPARAM0. )
Each argument value is automatically saved by Devtest into a property by the name request_<arg_name> , in this case it will be called request_URLPARAM0
You can change your response to contain the following
{
"status": 404
"error": "Not Found"
"message":"{{request_URLPARAM0}} is not found"
}
Hope that helps
Regards
Tanveer