Display print change upon button trigger

hi i tried to write code for 1st friend but not getting idea for other friends name

#include <LiquidCrystal.h>

const int buttonPin = 2;
int buttonState = 0;

void setup()
{
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print("Hello All");

// initialize the pushbutton pin as an input:
pinMode(buttonPin, INPUT);

if (buttonState == HIGH)

// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print("Jon");

}

void loop()
{

}