What is how to respond to happy friday?

As an AI language model, I don't have emotions in the same way as humans do. But here are some ways to respond to someone who says Happy Friday:

1. "Thank you! I'm so excited for the weekend."
2. "You too! Any fun plans for the weekend?"
3. "Happy Friday to you too! Let's make it a great day."
4. "Yay! Finally time for some relaxation."
5. "Thanks, it definitely feels like a good day to celebrate."