What does the woman advise the man to do?

W: Can I help you?
M: Yes. I am traveling in this city and I need a room with one singe bed for one night.
W: OK. This is the key for your room. It is Room 402.
M: Thank you.
W: By the way, if you check out after 12: 00 tomorrow, you would have to pay the rent for another day.
M: I see.