Here is a list of the things you can get by doing the generic profession quests, from people like "(a scientist)", etc. I ran these all out of Wayfar and a cursory check of NPCs in other cities seem to give the same results, but YMMV. Note, only NPCs that are stationary give out these quests, the ones roaming the streets are just for decoration.
If you have a deliver mission you can keep the delivery item by just aborting the quest, it won't disappear. If you need to fetch an item, just put it in your backpack/bank/house (as long as it isn't in your main inventory) and abort the quest. For escort missions, I've found you don't actually have to bring the target NPC back to the quest giver, as long as get the "return for reward" waypoint you can immediately return for the reward.
The items you deliver/fetch/receive are quoted, the strings are probably not exactly right but you get the idea of what you receive.
All the scientist quests either give "a recorde image" or "preserved rare insect" as a reward, it appears to be random.
Fetch "an empty cage"
Fetch "a rare artifact"
Kill a mad scientist
Kill an assassin (4k HAM)
All the businessman quests either give "a used ticket" or "engraved ink pens" as a reward, it appears to be random.
Deliver "an award for sporting excellence"
Deliver "a locked briefcase"
If you have a bad Thug faction (and who doesn't) and need to converse with the target NPC, just be greater than 65m away so you are not in combat range then select the target NPC and type "/conv" this will finish the quest.
Deliver "a black sun medallion" "holocron splinters"
Fetch "an electronic key" "a loudspeaker"
Fetch "a camera" "a broken decrypter"
Fetch "a back sun medallion" "a decorative shisha"
Fetch "a dark jedi medallion" "holocron splinters"
Escort a new person "holocron splinters"
Deliver "an electronic key" "a loudspeaker"
Escort partner "a loudspeaker"
Fetch "a decorative bowl" "a recording rod"
Fetch "a ledger" "an official proclamation"
*Deliver "an heirloom drinking glass" "an elegant woven basket"
Fetch "a hyperdriver part" "a phographic image"
Escort drunk friend "a hyperdrive part"
Escort sibling rivalry "a decorative bowl"
Deliver "a locked briefcase" "dud firework" (Firework graphic)
Escort for a reception "a ledger"
Deliver "a camera" "dud firework" (Firework show graphic)
Deliver "a decorative bowl" "a recording rod"
Escort not a friend "an heirloom drinking glass"
*This might a Fetch quest, I forgot to write it down.