If your friend is not responding to your messages, you could say:

"My friend isn't responding to my messages."

"I haven't received a reply from my friend."

"My friend seems to be ignoring my messages."

It's important to remember that there could be many reasons why your friend is not responding to your messages. They may be busy, distracted, or experiencing technical issues. It's always a good idea to try to communicate directly with your friend before jumping to conclusions.