(1) Definition of Solicitation.  A person is guilty of solicitation to commit a crime if with the purpose of promoting or facilitating its commission he commands, encourages or requests another person to engage in specific conduct which would constitute such crime or an attempt to commit such crime or which would establish his complicity in its commission or attempted commission.

  (2) Uncommunicated Solicitation.  It is immaterial under Subsection (1) of this Section that the actor fails to communicate with the person he solicits to commit a crime if his conduct was designed to effect such communication.

  (3) Renunciation of Criminal Purpose.  It is an affirmative defense that the actor, after soliciting another person to commit a crime, persuaded him not to do so or otherwise prevented the commission of the crime, under circumstances manifesting a complete and voluntary renunciation of his criminal purpose.