Jesus body was in the tomb for 3 days, but his spirit went down into Sheol/Hades, the same place where Abraham and Lazarus were, as well as the rest of the OT saints.
The reference to "paradise" is referring to that place of comfort where Lazarus and Abraham were, not heaven. If you can remember correctly, when Jesus resurrected and appeared to Mary Magdalena, Jesus told her not to hang on to Him because He had not yet ascended to His Father, meaning that he had not yet ascended to heaven, which means that place referred to as paradise was not heaven. The spirits of both Jesus and the thief were in Hades in that place of comfort/paradise.
On the contrary, the word of God confirms how right I am.
In answer to your question, if you read the event in its plain literal meaning, obviously, Abraham and the rich man were having a conversation. For the context states that the place where Abraham and Lazarus were was divided by a great chasm so that no one could pass over from either side. What you're doing is ignoring the literal information given within the context and assigning some symbolic meaning and thereby distorting it.
I don't have to name just one thing, but everything in the context demonstrates that Jesus was revealing a literal event, with literal people, which He was aware of prior to His incarnation. There is nothing in the context that would lead the reader to apply a parabolic meaning. It is by force that you and others interpret it as a parable. For if you just read it in its plain literal sense, it means what it says.
Parables use symbolism to represent what is literal. The rich man and Lazarus does not read like a parable. For it uses the real names of Abraham, Lazarus, Moses, mentions the prophets, the rich man's father and his five brothers, as well as the real location of Hades. Parables don't do that.
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Strong's Concordance
hadés: Hades,
the abode of departed spirits
Original Word: ᾍδης, ου, ὁ
Part of Speech: Noun, Masculine
Transliteration: hadés
Phonetic Spelling: (hah'-dace)
Definition:
Hades, the abode of departed spirits
Usage:
Hades, the unseen world.
HELPS Word-studies
86 hádēs (from
1 /A "not" and
idein/eidō, "see") – properly, the "unseen place," referring to the (invisible) realm in which all the unrighteous dead reside, i.e. the present dwelling place of all the departed (deceased);
Hades.