HI Ratna
You can use Touch UI widgets in Touch UI dialogs by specifying the Granite UI resource type.
For example:
granite/ui/components/foundation/form/textfield
defines a textfield.
Also - i recommend that you watch this GEMS session - modifying the Touch UI.
https://helpx.adobe.com/experience-manager/using/extending-aem-6-administrator-user.html
The link to the GEMS session is located in the first section of the article.