Your standard holodeck, it is capable of generating anything your heart desires from a dinner date at a 50's diner to a walk in the park under the evening sun.

Start by saying "Computer" then tell it what you want it to produce and when you want to start a new program simply call for the computer again by saying "Computer" then tell it "End Program"

Example:

User: Computer

Holodeck: Confirmation tone

User: <What program you wish to run, anything from a location to a person or even the kobayashi maru scenario>

Once the program has reached its conclusion, you can either say "Computer" and then say "End Program" or "Computer End Program"

You can even run multiple programs by telling the computer to save your current program "Computer save program as Alpha1"

You can pick up the program again by asking the computer to load the previous program

"Computer load program Alpha41"