If you notice that the current device you’re using has no connection, but other gadgets in the office are connected, the problem may be your device. Take a look at the connection settings on your device and disconnect from the network. Where the settings can be found depends on the device. After about 15 seconds, reconnect with the network.
If you find that you’re connected with the network, but there’s still no internet, then it’s time to run a diagnosis on the network. On PC, all you have to do is find the Wi-Fi icon, right click, then click on troubleshoot problems. For Mac users, go to System Preferences, then click on Network.