When someone expresses that they are really happy to hear something from you, it's always thoughtful to acknowledge and reciprocate their positive sentiment. Here are a few possible responses:
**Thank you so much! I'm glad my message brought you joy.
**I'm delighted to hear that my words made you happy!
**Your kind words mean a lot to me. I'm happy to have been able to bring a smile to your face.
**It warms my heart to know that my message had such a positive impact on you.
**I'm grateful for your happiness, and I hope my words continue to brighten your day.
**Your happiness is contagious! I'm smiling too knowing that I could make you happy.
**I appreciate your kind response. Your happiness brings me happiness as well.
Remember to be sincere in your response and tailor it to your own communication style and relationship with the person. Showing appreciation for their happiness and expressing your own positivity can strengthen your bond with them and create a positive interaction.