Is it legal for roommates to book hotels on their behalf?

Legal. It is legal for people who live together to book hotels on their behalf, but it should be noted that the booking agent needs to provide real identity information and contact information, and the booking agent needs to ensure that the information provided is accurate. It is legal to book a hotel by yourself, but it should be noted that the booking agent should provide real information and communicate with the guests to confirm it, so as to avoid unnecessary trouble.