Odd and even itemize symbols

Question

I want to make a dialogue between two people with the "commenting icon" in front of every sentence. I somewhat got what I want by using enumitem and fontawesome packages.

Here is my code so far.
documentclass{article}
usepackage{enumitem}
usepackage{fontawesome}
usepackage{xcolor}
begin{document}
    begin{itemize}
        item[color{blue!70!white}faCommenting] First person
        item[color{green!70!black}faCommentingO] Second person
        item[color{blue!70!white}faCommenting] First person
    end{itemize}
end{document}

Now I'd like to define it as a new environment to use this multiple times. I know there is a labelitemi command but it makes change for all items, for this I am not sure how to do it.
I did look up for old questions and found this but couldn't understand the steps to have them fit my case.

Bernard · Accepted Answer

Here is a solution with the newtoggle command from etoolbox. To simplify the use of this solution, I defined a new itemize-like environment, alternitem:
documentclass{article}
usepackage{enumitem}
usepackage{fontawesome}
usepackage{xcolor}
usepackage{etoolbox}
%
newtoggle{greeny}
newlist{alternitem}{itemize}{1}
setlist[alternitem]{label={iftoggle{greeny}%
{color{green!70!black}faCommentingOglobaltogglefalse{greeny}}%
{color{blue!70!white}faCommentingglobaltoggletrue{greeny}}%
}}

begin{document}

begin{alternitem}
 item First person
 item Second person
 item First person
 item First person
 item Second person
 item First person
 end{alternitem}

end{document}

schtandard · Answer

You can make a command that changes its own definition, and use that as the label, for example like this:
documentclass{article}

usepackage{enumitem}
usepackage{fontawesome}
usepackage{xcolor}

makeatletter
  defspeech@bubble@a{%
    color{blue!70!white}faCommenting
    globalletspeech@bubblespeech@bubble@b
  }
  defspeech@bubble@b{%
    color{green!70!black}faCommentingO
    globalletspeech@bubblespeech@bubble@a
  }
  newlist{dialog}{itemize}{1}
  newlist{dialog*}{itemize}{1}
  setlist[dialog]{
    before={globalletspeech@bubblespeech@bubble@a},
    label={speech@bubble},
  }
  setlist[dialog*]{
    before={globalletspeech@bubblespeech@bubble@b},
    label={speech@bubble},
  }
makeatother

begin{document}

First person first:
begin{dialog}
  item bla
  item bla
  item bla
  item bla
  item bla
end{dialog}

Second person first:
begin{dialog*}
  item bla
  item bla
  item bla
  item bla
  item bla
end{dialog*}

end{document}

Odd and even itemize symbols

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