def update(self, friendly_name=values.unset, unique_name=values.unset):
data = values.of({'<STR_LIT>': friendly_name, '<STR_LIT>': unique_name, })<EOL>payload = self._version.update(<EOL>'<STR_LIT:POST>',<EOL>self._uri,<EOL>data=data,<EOL>)<EOL>return FieldTypeInstance(<EOL>self._version,<EOL>payload,<EOL>assistant_sid=self._solution['<STR_LIT>'],<EOL>sid=self._solution['<STR_LIT>'],<EOL>)<EOL>
Update the FieldTypeInstance

:param unicode friendly_name: A user-provided string that identifies this resource. It is non-unique and can up to 255 characters long.
:param unicode unique_name: A user-provided string that uniquely identifies this resource as an alternative to the sid. Unique up to 64 characters long.

:returns: Updated FieldTypeInstance
:rtype: twilio.rest.preview.understand.assistant.field_type.FieldTypeInstance