Han has a look on his face that seems to say 'uhhhhh'. Despite the fact that he has a partner that is constantly looking out for him, it doesn't seem as if he had planned for this moment at all.

... which then changes over to a sort of faint smile when she suggests that Chewie could come up. She must like him if she's willing to meet his friend, right?

"Well, I don't know that it's fair to put you on the spot like this ..."

Chewbacca snorts and woofs a short comeback that gets translated by Harrison as 'you put her on the spot, Han.' Han seems bewildered by the fact that her ship can act like a translator.