He and Layton couldn't find anything, so he wasn't surprised that the others also couldn't find any at all, as they had even searched farther and patrolled the whole frozen land that they were at, but still hadn't seen the herb that Danta and the others mentioned.
Here is the edited text with spellings, typos, and minor grammatical errors corrected while strictly preserving your exact phrasing, dialogue tone, and narrative flow:
With the agreement of Danta, Ryzel asked Layton to set up a tent that they could temporarily use.
Danta and the others had also made their camp, but Ryzel wasn't satisfied with its temperature protection as well as other features, especially when it comes to contamination filtration and other things related to cleanliness.
