Obviously inexperienced farm boy and old man with dated mannerisms
I think it's more a question of Han trying to impress who he assumes are just a couple of local hicks than him not knowing the basics of space navigation.
: "We want to go to a big important planet on the other side of the galaxy, now
, because we're apparently in trouble with the law or something, or else we've pissed off someone we shouldn't have".
: "Well, you've come to the right place. My ship made the Kessel Run in less than 12 parsecs...And it has a point-five doohickeytron engine with bullshit injectors".
Farm boy (wide-eyed ignorance)
Old man (Trusting)
: "Why, that does sound impressive, good sir".
: "Yep! Which is why I'm charging the perfectly normal
rate of half a zillion credits which, being such experienced space travellers, you know
is a good bargain!"