A system for engaging in an automated dialog with a user, the system comprising: a processor ; and a memory , wherein the memory stores instructions that, when executed by the processor , cause the processor to: retrieve a preset dialog flow, the dialog flow having a plurality of blocks directing the dialog with the user, the plurality of blocks for being represented as a dialog tree; traverse the dialog tree; provide a prompt to the user based on a current block of the plurality of blocks of the dialog tree; receive an action from the user in response to the prompt; retrieve a classification tree corresponding to the dialog flow, the classification tree having a plurality of nodes mapped to the plurality of blocks, the classification tree being traversed concurrently with the traversal of the dialog tree to compute a probability for each of the nodes based on the action from the user, each of the nodes representing a user intent; select a particular node of the plurality of nodes based on the computed probabilities; identify a target block of the dialog flow corresponding to the particular node; and output a response in response to the identified target block. a processor ; and a memory , wherein the memory stores instructions that, when executed by the processor , cause the processor to: retrieve a preset dialog flow, the dialog flow having a plurality of blocks directing the dialog with the user, the plurality of blocks for being represented as a dialog tree; traverse the dialog tree; provide a prompt to the user based on a current block of the plurality of blocks of the dialog tree; receive an action from the user in response to the prompt; retrieve a classification tree corresponding to the dialog flow, the classification tree having a plurality of nodes mapped to the plurality of blocks, the classification tree being traversed concurrently with the traversal of the dialog tree to compute a probability for each of the nodes based on the action from the user, each of the nodes representing a user intent; select a particular node of the plurality of nodes based on the computed probabilities; identify a target block of the dialog flow corresponding to the particular node; and output a response in response to the identified target block. retrieve a preset dialog flow, the dialog flow having a plurality of blocks directing the dialog with the user, the plurality of blocks for being represented as a dialog tree; traverse the dialog tree; provide a prompt to the user based on a current block of the plurality of blocks of the dialog tree; receive an action from the user in response to the prompt; retrieve a classification tree corresponding to the dialog flow, the classification tree having a plurality of nodes mapped to the plurality of blocks, the classification tree being traversed concurrently with the traversal of the dialog tree to compute a probability for each of the nodes based on the action from the user, each of the nodes representing a user intent; select a particular node of the plurality of nodes based on the computed probabilities; identify a target block of the dialog flow corresponding to the particular node; and output a response in response to the identified target block. <EOS>