Hafs bin Asim (may Allah have mercy on him) says that Sayyiduna Ibn Umar (may Allah be pleased with them both) narrated to us that I have accompanied the Prophet Muhammad (peace and blessings be upon him), and I never saw him offering Sunnah prayers during travel, and Allah, the Exalted, has said: "Indeed, in the Messenger of Allah (peace and blessings be upon him) you have a good example." (__QUR_33:21__)