'Process the initial command result.
Arguments:
iq      -- The iq stanza containing the command result.
session -- A dictionary of data relevant to the command
session. Additional, custom data may be saved
here to persist across handler callbacks.'

def _command_start(self, iq, session):

    form = self['xep_0004'].makeForm(ftype='submit')
    form.addField(var='greeting', value=session['greeting'])
    session['payload'] = form
    session['next'] = None
    self['xep_0050'].complete_command(session)
