An old one from the days of typewriters

 My typist has gone on her holiday,
 My tipist has gone on a s-ree,
 My tipst hap gone oh hyr hadidpy,
 O gring bacq my hipist to me.
 Bling bac? oK lring bac,
 Oh bynl b4ck my tpisth to me tu mo
 Brung bacff ocsling 8 ac
 Oh blyK ba’k mg ?t/qts?m.O darn!