Asistance or Assistance: How To spell?
The word Asistance is misspelled against Assistance, a noun meaning "An assistant or helper; a body of helpers."
Assistance has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings a & istance which should not be misspelled with single 'S'
Wrong Spelling:  a-s-istance  Correct Spelling:  a-ss-istance 
Find more wrongly spelled words of Assistance to spell it well.