Answer :
The information that the dialogue revealed was that the guards do not recognize each other at first.
From the complete question, we can deduce that the guards didn't recognize each other at first. Bernardo didn't see Francisco properly at first and he thought that he was the king before he saw him clearly.
A dialogue simply refers to a conversation between two to more people. The effect of the dialogue was that it caused a feeling of confusion and distrust. Bernardo and Francisco were confused.
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Answer:
1st: The guards do not recognize each other at first
2nd: It creates a feeling of confusion and distrust