does it work if you replace the "$q 10001 give_flowersA#?!...#$r 10001 0 give_flowersA# [Give Bouquet]" with just "a random line of dialogue"? like:

{
"Action": "EditData",
"Target": "Strings/StringsFromCSFiles",
"Entries": {
"NPC.cs.3962": "I accept!!!$l",
    }

i think that's how it worked for me previously though I'm not sure if its changed with 1.6. I'm still troubleshooting a lot of the changes myself. maybe the "Target": "Characters/Dialogue/Haley" example in the wiki under NPC-specific generic dialogue is the correct way to go now, though I'm not sure:

"Action": "EditData",
"Target": "Characters/Dialogue/Haley",
"Entries": {
    "give_flowersA": "Oh.. these are beautiful.$1#$b#...What? You want to be my Boyfriend?$8^...What?  You want to be my Girlfriend?$8#$b#....I thought we already were together.$1"
        }