The Bright Side

Dee: Wait, you don't know who sent this?
Emily: Not a clue.
Dee: Seriously?
Emily: Yeah, why? Do you know?
Dee: No, I don't know, I just thought you'd have some idea. I mean, there can't be many people who'd send you a letter like this, can there?
Emily: Exactly! I can't believe anyone would.
Dee: So you... heh! You really can't think who might have sent this?
Emily: No, I really don't know. And I've been thinking for like three hours straight! Well I played video games for two hours, but. Do you have any ideas?
Dee: Nope.