Many new joiners don't know how to reply to people (I was the same, it's Ralle's fault don't worry xD).
I just saw that you're replying to people on your own VM. IF you want them to see your replies you should:
1. Open their profile and answer there.
2. Click "View Conversation" (left down corner on the message you received from someone) and chat there.
That's all ;D
Also, Hello