<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def update(self, friendly_name=values.unset, unique_name=values.unset):
 """ Update the FieldTypeInstance :param unicode friendly_name: A string to describe the resource :param unicode unique_name: An application-defined string that uniquely identifies the resource :returns: Updated FieldTypeInstance :rtype: twilio.rest.autopilot.v1.assistant.field_type.FieldTypeInstance """

        return self._proxy.update(friendly_name=friendly_name, unique_name=unique_name, )