Luke's Gospel of Mark - Is There a Conflict?

Mark invisions a post resurrection appearance of jesus to the disciples in galilee. That's also what happens in matthew, if you look at matthew 28. But luke omits this reference, even though it's right there in front of him in his source,. mark, he omits it, and instead focuses on post resurrection appearances that occurred in jerusalem and its vicinity. He makes no mention of the disciples going to galilee. Instead, luke records jesus telling the disciples. Thus it is written that the christ should suffer and on the third day rise from the dead. repentance and forgiveness of sins should be preached in his name to all nations, beginning