diff --git a/src/transaction_system.cpp b/src/transaction_system.cpp
index cb72010..8e79eca 100644
--- a/src/transaction_system.cpp
+++ b/src/transaction_system.cpp
@@ -346,6 +346,11 @@ std::string TicketSystemEngine::RefundTicket(const std::string &command) {
       }
     }
   }
-  response_stream << "[" << command_id << "] RefundTicket";
+  hash_t user_ID_hash = SplitMix64Hash(user_name);
+  if (online_users.find(user_ID_hash) == online_users.end()) {
+    response_stream << "[" << command_id << "] -1";
+    return response_stream.str();
+  }
+  response_stream << "[" << command_id << "] 0";
   return response_stream.str();
 }
\ No newline at end of file
diff --git a/src/user_system.cpp b/src/user_system.cpp
index e572bf7..5a33b91 100644
--- a/src/user_system.cpp
+++ b/src/user_system.cpp
@@ -89,6 +89,7 @@ std::string TicketSystemEngine::AddUser(const std::string &command) {
   strcpy(dat.name, name.c_str());
   strcpy(dat.mailAddr, mailAddr.c_str());
   user_data.Put(new_user_username_hash, dat);
+  transaction_manager.PrepareUserInfo(SplitMix64Hash(username));
   LOG->debug("stored user_name hash: {}", new_user_username_hash);
   LOG->debug("stored user_name: {}", dat.username);
   LOG->debug("stored password hash: {}", dat.password_hash);