[ It does sound concerning, and Lan Xichen is an easily worried individual, so instead of being reassured, he approaches Noah more intently, checking to see if he needs any obvious help. If he's brushing the surprise off, then he might be dismissing even more pains. Xichen doesn't want to let anyone deal with that sort of thing alone. ]

This city? It's a strange place. There are things here I have never encountered before, but apparently other visitors here are familiar with them. You don't have to worry. I'm sure we can assist you.

[ Assuming there is a problem in the first place. But maybe also because Noah seems lonely to him. ]