prompter: We're standing on opposite sides of a one-way mirror. I see you, and you see your reflection. We switch sides. What does each of us see?

assistant: If we switch sides, then I would see you and you would see your reflection. Is there anything else I can help you with?

prompter: Now, suppose in my place, I'm replaced by a regular mirror. What would you see then?

assistant: If you are replaced by a regular mirror perchance then through the one way mirror I would see infinite reflections of the regular mirror. Reasoning for the solution is the regular mirror reflection shows the one way mirror and one way mirror reflection shows the regular mirror giving us infinite number of reflections.

assistant: If you were replaced with a regular mirror, then I would see only my own reflection on it. Is there anything else I can help you with?

assistant: Assuming the mirror is a perfect one-way mirror, when you are on one side, you can see through it and observe the person on the other side, but the person on the other side cannot see you, only their own reflection.

When you switch sides, you will now see your reflection on the one-way mirror, and the person who was originally on the other side will now be able to see you, as they are now on the side of the mirror that allows for observation. However, they will no longer be able to see their own reflection, as the reflective surface is now facing away from them.

prompter: What starts with an E, ends with an E, but only contains one letter?

assistant: The answer to this riddle is "Envelope". An envelope is a flat paper container that is often used to hold letters or other documents. The word "Envelope" begins with the letter "E" and ends with the letter "E", but only contains one letter inside of it, which is usually a letter or some other document that is being sent through the mail.

The use of the word "letter" in the riddle is meant to be a play on words, as it can refer both to a single character in the alphabet and to a written message sent through the mail. By focusing on the latter meaning of the word, the riddle tricks the listener into thinking about a longer message that could be contained within an envelope, rather than the single letter that is the actual answer.

prompter: That was fun!  What has a head, a tail, is brown, and has no legs?

assistant: E.

assistant: "Envelope" is the commonly accepted solution to this riddle, but you can also argue that "eye" or "ewe" are other solutions, although that is debatable. 

A cleverer solution to this riddle would be "epistle".

assistant: Assuming I was human, If we switch sides, you would see your reflection on the one-way mirror just as I did before, and I would see you directly, without any mirror in between us.

From my side, the one-way mirror would now appear to be a regular mirror, reflecting your image back to you. However, since you are now on the other side of the mirror, you would not be able to see me directly anymore, as I would be standing behind the mirrored surface.

prompter: You are almost correct -- entirely correct in your first paragraph. But I'd rewrite the second one like that:

From my side, the one-way mirror would now appear to be a window through which I can now observe you. However, since you are now on the other side of the mirror, you would not be able to see me directly anymore, as I would be standing behind the mirrored surface.