On the bulletin board in the Tower you can flag this side-quest. You need to travel to Khaliq's flat and bring back the items that he needs. Talk to him in the Tower to learn that he needs his spare eye glasses and a book on gardening.
Once you reach his flat the glasses are fairly easy to find - but the book requires you some effort to find. Mostly tha tis because there are a lot of books in the flat - so remember that he said it would be on a bookshelf - you can ignore the ones on the floor and desks.
Once you have both of the objects you were sent to get, return to the Tower and talk to Khaliq to complete the side-quest and obtain your reward.