--Code.gs
 |
 |- openFormModalDialog()
 |- fetchData()
 |- updateSheet()
 |
--form.html

function openFormModalDialog() {
  var ui = SpreadsheetApp.getUi();
  var htmlOutput = HtmlService
     .createHtmlOutputFromFile('user-info')
     .setWidth(400)
     .setHeight(300);
  SpreadsheetApp.getUi().showModalDialog(htmlOutput, 'User Information');
}