Obi-Wan would like some fresh air himself, so he could sympathize. He missed being around nature. If there was a garden, it would be more tolerable. But they had to make due.

"Of course, you're more than welcome to help."

He then offered her one of the pieces of cloth he found that he had been using as rags.

"In fact, once we're done here, perhaps you could cover the ladies' refresher."

Because, you know, it wouldn't be all that appropriate for him to go in there.