code: public boolean hasSlotIsEqual(final String slotName, final String value) {
          final String slotValue = getSlotValue(slotName);
          return (slotValue != null && slotValue.equals(value)) ||
                  slotValue == value;
      }
docs: Checks if a slot is contained in the intent request and also got the value provided.
  @param slotName name of the slot to look after
  @param value the value
  @return True, if slot with slotName has a value equal to the given value