Vlookup in Schedule

I have a spreasheet that looks like the attached. The date is merged into 2 cells, with the daytime and afternoon shifts mated to that, and then the available number of people beside it.

I want to perform a lookup on this data from another sheet, however I need to look up the date AND if it is Daytime or Afternoon shift.

Can someone please help with which formula(s) I would use.

Thanks.