for Andrew I have Leon Lupin they may be business associates since Leon is high up in the family shipping business? They're also fairly close in age so may know one another from school.

and I have Eileen Buchanan for Coleman, though sheeeee's not all the friendly especially if he's being a nuisance in her pub (The Leaky Cauldron). They were in school at the same time (Leeny a year ahead) but both Puffs, so they may even know one another from there and then she may likely be a little more personable!