Lan Wangji watched in curiosity to see that Wei Wuxian is really having a conversation with a family of chipmunks...and they talked, understanding back to back, the conversation isn't one way. He is perplexed and amazed that it actually works, so he won't question it.

Trying to figure out an idea of what to ask, "Why not ask them what they know of the hotel?" It's a generic question looking for a generic answer, as he figures the thoughts and ideas a chipmunk is simple and less complex that of the humans.