I have an array that is conference rooms with corresponding reservations. The conference rooms are repeating, but the corresponding reservations will be different, and I want no repeating conference rooms and to merge all the reservations for each conference room. 

```
This is what I have:
['conference room one', ['reservation 2', 'reservation 1', 'reservation 3']]
['conference room two', ['reservation 7', 'reservation 5', 'reservation 6']]
['conference room two', ['reservation 10', 'reservation 11', 'reservation 12']]
['conference room one', ['reservation 9', 'reservation 8', 'reservation 15']]
['conference room one', ['reservation 17', 'reservation 14', 'reservation 13']]

This is what I want:
['conference room one', ['reservation 2', 'reservation 1', 'reservation 3', 'reservation 9', 'reservation 8', 'reservation 15', 'reservation 17', 'reservation 14', 'reservation 13']]
['conference room two', ['reservation 7', 'reservation 5', 'reservation 6', 'reservation 10', 'reservation 11', 'reservation 12']]

```

(deleted a screenshot that was here because it was irrelevant and distracting)