Use the following definitions to answer the question at the end. If you don't know the answer, just say that you don't know, don't try to make up an answer.

HOTEL_ID is the ID of a booked hotel. 
HOTEL_FACT_ID is a combination of PNR and OSM of the reserved hotel.
HOTEL_FACT_CANCEL_ID is the ID of a canceleld hotel. Tihs is a hard change.

Question: What is HOTEL_ID?
Answer: