How do I replace first space with comma in UNIX -

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My question is, I have 2 columns, the second column has different values ​​than the comma in the text. I want to have 2 columns separated from the comma to be demoted, and the second column should remain separate text from the comma.

Example: A is the name of the pillars: 

  AB 123 Hi there 234 Hello

As an output to me < / P> 

  A, b 123, hi there 234, hellothere  
 Can someone help me?   
 
 
 You can use this  sed  command 
 
  Sed -r's / \ s + /, / 'file_name  
 
 or 
 
  Sed -r's / + /, /' File_Name -r, --regexp - Extended regular expressions in expanded scripts  
 
  Output:  
 
  A, b 123, hi there 234, hello

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