conversations.from: human
conversations.value: On a 16 GB (gigabyte) capacity USB drive, 50% is already busy. Calculate the number of gigabytes still available.
conversations.from: assistant
conversations.value: We calculate 50% of 16 GB:
  50/100 * 16 GB = 0.5 * 16 GB = 8 GB
  That leaves 16 GB - 8 GB = 8 GB available on this key.