sorry I meant her sister Jin and the waitress I know where they are Jin is in her sister's room and the other one is in the bar and I check the whole hotel at all hours and I still can't start the task
Does the waitress have a name?
What relationship level are Jin and the waitress?
I do not recall a task with Jin and some waitress.
There is FAQ page in the Wiki.
I check the whole hotel at all hours
What parts of the Hotel have you not visited?
Is there a specific button you're trying to click? If you're trying to advance Jin's level, it would help to know what level she currently is.
