Yes no validation

Private Function yesno() As Boolean
        Console.WriteLine("y/n")
        Select Case LCase(Console.ReadLine())
            Case "y"
                yesno = True
            Case "n"
                yesno = False
            Case "yes"
                yesno = True
            Case "no"
                yesno = False
            Case "ok"
                yesno = True
            Case "i would"
                yesno = True
            Case "i would not"
                yesno = False
            Case Else
                Console.WriteLine("I didn't understand your reply!")
                Console.WriteLine("Please answer with 'yes' for yes or anything else for no!")
                If Console.ReadLine() = "yes" Then
                    yesno = True
                Else
                    yesno = False
                End If
        End Select
    End Function