The subject invention relates to systems and methods that enable dynamic programming and execution of an electronic communications dialog. In one aspect, a configurable messaging system is provided. The system includes a configuration file to describe interface options of a computerized dialog session, wherein the configuration file specifies interface activities and state transitions between the interface options within the configuration file. A state controller executes the interface options during communications activities with the dialog session. The configuration file can also describe prompt elements to solicit information from users or applications.