ShortRiddles #1 - women in hotel room

There was an women in hotel hoom reading a book and suddenly she hears a knock at the door.

She opens the door and see a Handsome looking man whom she never seen before.

She asks "who are you? What do you need?"

The man replies "oh i am sorry, i thought it was my room, my mistake".

Then he simply takes the elevator and went down the corridor.

Immediately the women went back her room and informs about the person to security.

What makes the women so suspicioys of the man?

Comment your answers down.