I work in a hotel, and suddenly I have to sign a labor contract with an unknown third-party labor service company. Is this reasonable?

In this case, the hotel probably doesn't want to develop a labor contract relationship with you directly, but wants to use you through labor dispatch. Actually, this is normal. However, if you don't want to cause trouble to the hotel, you don't have to sign a labor contract with the third company, but you have every reason to fully understand the relevant information of the third company, including the company address, industrial and commercial registration situation, legal representative and so on. In order to safeguard rights smoothly in the future. Company information can be found through the local industrial and commercial bureau. I hope it helps you.