When the interviewer asks, “How are you?”, try to reply with words other than “fine”. You can respond with more detail and say something about your day. 

Here are a few ideas: 

“Fine, thanks. The traffic was smooth getting here and it was easy to find your office.”

“I’m good thanks. I’ve been looking forward to this interview, so I’m happy to be here.”

Keep your answer positive so you’ll leave a good impression to your interviewer.