1. A method comprising: recognizing speech of each speaker in a plurality of speakers on a conference call, to yield recognized speech for each of the plurality of speakers, wherein the speech of each speaker from the plurality of speakers is received via a speech interface; recording metrics associated with the recognized speech for each of the plurality of speakers, wherein the metrics comprise a request for repetition, a negative response to confirmation, and a task completion; after recording the metrics, while recording further speech from the each speaker from the plurality of speakers, modifying an attribute of the speech interface based on the metrics, to yield a modified speech interface; and recognizing additional speech during the conference call from an identified speaker in the plurality of speakers using the modified speech interface.