Hi I have seen this often in code, but when I speak of it i don't know the name of such 'pattern'

I have a method with 2 arguments that calls an overloaded method that has 3 arguments and intentionality sets the 3rd one to empty string.

public DoWork(string name, string phoneNumber)
{
    CreateContact(name, phoneNumber, string.Empty)
}

public DoWork(string name, string phoneNumber, string emailAddress)
{
    //do the work
}

The reason I'm doing this is I to not duplicate code, and allow the existing callers to still call the method that has only 2 parameters.

I have associate a few tags to this question, but it probably fit in more categories of questions.

Is this a pattern, and does it have a name?