android dialog box not running

this is my code in which the app is running just fine but the dialog box is not opening the button is clickable but no action is being performed

@Override
        public void onClick(View view){
            AlertDialog.Builder mBuilder = new AlertDialog.Builder(appointmentpage.this);
            View mView = getLayoutInflater().inflate(R.layout.dialog_otp,null);
            final EditText mOTP = (EditText) mView.findViewById(R.id.enterOTP);

            final Button mVerify = (Button) mView.findViewById(R.id.verify);

            mVerify.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    if(mOTP.getText().toString().isEmpty())
                    {
                        mVerify.setOnClickListener(new View.OnClickListener(){

                            @Override

                            public void onClick(View view) {
                            AlertDialog.Builder mBuilder1 = new AlertDialog.Builder(appointmentpage.this);
                                View mView1 = getLayoutInflater().inflate(R.layout.confirmation_final,null);



                            }
                        });
                    }
                    else{

                        Toast.makeText(appointmentpage.this,
                                "Enter OTP",
                                Toast.LENGTH_SHORT).show();
                    }
                }