28. The computer-readable storage media of claim 23 , wherein determining that the first annotation accurately characterized the first input conversational turn comprises: determining that conversational turns occurring after the first input conversational turn in the dialogue indicate that the first annotation accurately characterizes the first input conversational turn.
28. The computer-readable storage media of claim 23 , wherein determining that the first annotation accurately characterized the first input conversational turn comprises: determining that conversational turns occurring after the first input conversational turn in the dialogue indicate that the first annotation accurately characterizes the first input conversational turn. 29. The computer-readable storage media of claim 28 , wherein determining that conversational turns occurring after the first input conversational turn in the dialogue indicate that the first annotation accurately characterizes the first input conversational turn comprises: determining (i) that a task was completed as a result of the dialogue and (ii) that no slot values assigned in the first annotation were changed or removed by the user in any of the conversational turns occurring after the first input conversational turn in the dialogue.