A method for processing user input includes the step of receiving, during a first session between a user and an interaction environment, via one of a plurality of media gateways, from the user, a resource including a plurality of predefined markers and at least one expression. An expression type is identified, responsive to an evaluation of the semantic structure and to one of the predefined markers. A determination is made as to whether to store at least one of: an identification of the user and the at least one expression. The resource is displayed in a viewable display format, responsive to a second predefined marker. A second expression is received. An expression type is identified, responsive to an evaluation of a semantic structure of the second expression. Based on the expression type and on the resource received during the first session, a response to the second expression is generated.