Ok well I got the bill of sale from the safe in Novac but I can't lead that person in front of the dinosaur.Iit didn't even give me the option and I haven't even lead anyone else out there yet to be shot. WTF please help

Be sure that you've spoken to Boone beforehand and have definitely accepted his quest (he will give you a beret), sometimes you might have to wait for the suspect to go home (do it around midnight) and then you should have the option to ask them.

When you're standing with them in front of the dinosaur, equip the beret and *bang*, job done.

Did all that. I went to the house and she said something like its late is something wrong, it still doesn't give me the option