New command to turn to italics

Question

I'd like to create a command that will turn all of the text that follows into italics, but something isn't working.
Where am I going wrong?
p.s.: I know I could do it differently, but it's important that it's really a command!
documentclass[a4paper,11pt,draft]{report}
usepackage[utf8]{inputenc}

newcommandTom{parbigskipnoindenthbox to35mm{Tomhfil}hangindent=35mm }
newcommandMary{parbigskipnoindenthbox to35mm{Maryhfil}hangindent=35mm }
newcommandaction{parbigskipnoindentitshape}

begin{document}

Tom
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem
Ipsum is simply dummy text of the printing and typesetting industry.

action
This is the action line to put into the new text

Mary
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem
Ipsum is simply dummy text of the printing and typesetting industry.
    
end{document}

egreg · Accepted Answer

So long as you always follow the action directive with a blank line, you can do
newcommand{action}{} % to avoid overwriting an existing command
defaction#1par{parbigskipnoindenttextit{#1}par}

Full example with other fixes:
documentclass[a4paper,11pt,draft]{report}

newcommandTom{parbigskipnoindentmakebox[35mm][l]{Tom}hangindent=35mm }
newcommandMary{parbigskipnoindentmakebox[35mm][l]{Mary}hangindent=35mm }
newcommandaction{}
defaction#1par{parbigskipnoindenttextit{#1}par}

begin{document}

Tom
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem
Ipsum is simply dummy text of the printing and typesetting industry.

action
This is the action line to put into the new text

Mary
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem
Ipsum is simply dummy text of the printing and typesetting industry.
    
end{document}

Alternative, but action<text> must be followed either by a blank line or one among Tom or Mary.
documentclass[a4paper,11pt,draft]{report}

newcommandTom{%
  parbigskipnoindentmakebox[35mm][l]{Tom}hangindent=35mm
}
newcommandMary{%
  parbigskipnoindentmakebox[35mm][l]{Mary}hangindent=35mm
}
makeatletter
newcommandaction{%
  begingroup
  parbigskipnoindentitshape
  defpar{endgroup@@par}%
}
makeatother

begin{document}

Tom
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem
Ipsum is simply dummy text of the printing and typesetting industry.

action
This is the action line to put into the new text
Mary
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem
Ipsum is simply dummy text of the printing and typesetting industry.
    
end{document}

New command to turn to italics

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