Android : How to wait for an okay button before starting a new activity

Good day.I have a problem, I am displaying a message box when a button is clicked.The message box simple shows a confirmation of registration.After that I open a new activity. The problem is that it shows the messagebox and then starts the new activity without waiting for the ok button to be clicked.How can I only display the new activity upon clicking the ok button.

Below is the code I used.

  @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.register);

        Button btn = (Button)findViewById(R.id.registerButton);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(getApplicationContext(), BookingActivity.class);
                AlertDialog.Builder dlgAlert  = new AlertDialog.Builder(context);

                dlgAlert.setMessage("You have successfully Registered.Please Press okay to continue");
                dlgAlert.setTitle("Registration");
                dlgAlert.setPositiveButton("OK", null);
                dlgAlert.setCancelable(false);
                dlgAlert.create().show();


                startActivity(intent);
                finish();
            }
        });