server.js

const http = require('http');
const url = require('url');
const port = 8000;

const requestHandler = (request, response) => {
  const parsedUrl = url.parse(request.url, true);
  if (parsedUrl.query.name && parsedUrl.query.city) {
    response.end(`Hello, ${parsedUrl.query.name} from ${parsedUrl.query.city}!`);
  } else {
    response.end('Please provide name AND city parameters');
  }  
};

const server = http.createServer(requestHandler);

server.listen(port, (err) => {
  if (err) {
    console.error('Something bad happened');
  } else {
    console.log(`server is listening on ${port}`);
  }
});

Ooops, changed console.log for response.end in requestHandler :)