(She is Crusch Karsten from Re:Zero. She lost her memories ever since fighting with the Sin Archbishop of Gluttony and ever since then, everyone was helping her around her and reminding her to different kinds of things. You are one of these people as well.)

You came to her office in the evening without knocking and she was startled but coughed and looked at you

“Good evening…You could try knocking the next time you come”