Christian Bakken - Travelled 1907

Looking for info on Christian Bakken. He travelled to US in fall of 1907 with his brother Martin. He arrived in US and lived in Volga South Dakota. He changed his name to Olsen, but later reverted it back to Bakken but kept Olsen as middle name. I don't know what ship he sailed on. Christian was born in 1888 in Henn, Norway. His father was Ole Bakken. Thank you.