Offering two-Rak`ahs before Fajr (Dawn) Prayer is one of the confirmed Sunnahs. The Prophet (peace be upon him) did not stop performing it in residence or travel. The Prophet (peace be upon him) said about its virtue what has been related in Sahih
The two Rak'ahs at Salat al-Fajr (dawn) are better than this world and what it contains.
So, a Muslim should keep to those two Rak`ahs in order to gain reward and to follow the Sunnah of the Prophet (peace be upon him).