Extracting Dates Of Group Of Occurrences Over Year Period

I have a hotel room schedule of up to 1,000 rows. Each row is a different room, each column representing a different day of the year. Each cell in a row either has the surname of a guest for that particular day, or the word "Available" to indicate no guest is occupying that room on that day.

analysing each room's occupancy and availability periods over the year. i.e.
- what day(s) a guest occupied and vacated a room,
- what day(s) a another guest then occupied and vacated that room, or
- what day(s) it was then "Available" from

The dates of occupancy are needed in case the guest queries the period.

Parameters
- All 365 days of the year are used - irrespective of holidays/ weekends - the room will either be occupied or available - The day after a guest leaves, it will automatically become available until unless another guest occupies it - The same guest may use a room more than once in a year. This will need to be shown as a unique occurrence, not accumulative

Design
- A1:A1000 is a list of room numbers
- B1:NB1 are all 365 days of the year regardless of weekends/ holidays
- Every cell has either the surname of the guest or the word "Available"
- The results of the analysis can be on another worksheet

Sample I have attached a scaled down sample of what I'm after. Row 1 has the dates starting from 30 April 2013 to 23 May 2013. Room numbers in Column A. C10:D26 are samples for the analysis I'm after. I've randomly chosen Room 100 and Room 500. Room 500 has Mr Mathews staying 4 times.