receiving a first message as part of a conversation in a computer-based conversational interface, wherein the first message is received via a user input;

generating, using a trained machine learning model of a computing system, a second message that is conversationally responsive to the first message, wherein the second message includes a variable representing a category of data;

determining, based on stored information specific to the user, a plurality of valid values for the variable in the second message, wherein the plurality of valid values belong to the category of data, and wherein the plurality of valid values are different and distinct from the conversation and include information that is specific to one or more accounts of the user;

selecting, using the trained machine learning model, a specific value from the plurality of valid values based on context in the first message and the second message;

replacing, using the computing system, the variable in the second message with the specific value to generate an updated second message, wherein the updated second message indicates an action to be performed using the one or more accounts of the user, and wherein the action is based on the specific value in the updated second message;

outputting the updated second message as part of the conversation using the computer-based conversational interface; and

performing the action by interacting with the one or more accounts based on the specific value.