In order to be able to use two-way data binding for form inputs you need to import the FormsModule package in your Angular module.
For more infos see the Angular 2 official tutorial [here][1] and the official documentation for [forms][2]


 [1]: https://angular.io/docs/ts/latest/tutorial/toh-pt1.html#!#two-way-binding
 [2]: https://angular.io/docs/ts/latest/guide/forms.html