Villager-Specific Dialouge

Solution 1:

Firstly, make a scoreboard objective for talking to villagers.

/scoreboard objectives add talk minecraft.custom:minecraft.talked_to_villager

Then, run this in a repeat command:

execute as @a[scores={talk=1..}] at @s positioned ^ ^ ^2 run tag @e[type=villager,limit=1,sort=nearest] add talk

That executes all players who have right clicked a villager to tag the nearest villager from two blocks in their direction with the talk tag. (Keep in mind that for this to work the villagers must not have any trades. I'm not sure if this works in 1.14, but if so summon them with {Offers:{}})

For this next part to work each villager must have a unique tag or score. Run this in a chain command:

execute as @e[type=villager,tag=talk,tag=<uniquetag>] at @s run tellraw @a[distance=..4] <insert text>

Run that command for each villager before continuing.

Then remove the talk tag from all villagers and reset all talk scores in repeat command blocks.

tag @e remove talk
scoreboard players reset @a talk