So I emailed two professors, both of which I did AWESOME in their classes, asking them for a letter of recommendation and it's been a week now and I still haven't gotten a reply back. I didn't really talk to them when I took their classes so could that be the reason? How can I remind them of how well I did without being annoying? Or is it just because of the fact that I didn't form a "bonding" relationship with them is why they completely ignored me...