Merge with? Comparing two lists in a diferent database

Hi guys, I am stuck trying to compare 2 databases. The first contains a list of hours available (8 am to 6 pm) It is a text. The second one contains the hours already taken (for instance 8 am) and I have an additional field for busy (Ocupado in spanish) to know in the database if that hour was taken. What I need to do is compare both databases an extract the new available hours. This is what I have tryed without success:

Thanks for your help.