The sentence is still too plain and lacks engaging content. Please provide more context on why the crowd workers were recruited, what the scenarios and models were, and what the purpose of this recruitment process was. Consider using more descriptive language as well as varied sentence structures to make the passage more interesting to read. Finally, consider rephrasing the sentence to make it more concise and clear.
We recruited a total of 189 crowd workers (or users) on Amazon Mechanical Turk. For each of the scenarios and models, we had three users each produce a dialogue. Wrap the entire output in JSON format.
user