In one embodiment, a method includes receiving from a client system a user request from a first user, determining a necessity for resolving the first user to a known entity to execute one or more tasks associated with the user request based on privacy restrictions associated with the user request, determining a set of candidate entities for the first user based on one or more machine-learning models, each candidate entity being associated with a respective confidence score greater than a threshold score, sending instructions for prompting the first user to select a candidate entity from the set of candidate entities, resolving the first user to a selected candidate entity responsive to receiving a selection from the first user, and executing the one or more tasks associated with the user request based on a user profile associated with the selected candidate entity.