### Database Schema:
CREATE TABLE Airlines (
	FL_DATE	TEXT	NULL,
	OP_CARRIER_AIRLINE_ID	INTEGER	NULL,
	TAIL_NUM	TEXT	NULL,
	OP_CARRIER_FL_NUM	INTEGER	NULL,
	ORIGIN_AIRPORT_ID	INTEGER	NULL,
	ORIGIN_AIRPORT_SEQ_ID	INTEGER	NULL,
	ORIGIN_CITY_MARKET_ID	INTEGER	NULL,
	ORIGIN	TEXT	NULL,
	DEST_AIRPORT_ID	INTEGER	NULL,
	DEST_AIRPORT_SEQ_ID	INTEGER	NULL,
	DEST_CITY_MARKET_ID	INTEGER	NULL,
	DEST	TEXT	NULL,
	CRS_DEP_TIME	INTEGER	NULL,
	DEP_TIME	INTEGER	NULL,
	DEP_DELAY	INTEGER	NULL,
	DEP_DELAY_NEW	INTEGER	NULL,
	ARR_TIME	INTEGER	NULL,
	ARR_DELAY	INTEGER	NULL,
	ARR_DELAY_NEW	INTEGER	NULL,
	CANCELLED	INTEGER	NULL,
	CANCELLATION_CODE	TEXT	NULL,
	CRS_ELAPSED_TIME	INTEGER	NULL,
	ACTUAL_ELAPSED_TIME	INTEGER	NULL,
	CARRIER_DELAY	INTEGER	NULL,
	WEATHER_DELAY	INTEGER	NULL,
	NAS_DELAY	INTEGER	NULL,
	SECURITY_DELAY	INTEGER	NULL,
	LATE_AIRCRAFT_DELAY	INTEGER	NULL,
	foreign key (ORIGIN) references Airports (Code),
	foreign key (OP_CARRIER_AIRLINE_ID) references `Air Carriers` (Code),
	foreign key (DEST) references Airports (Code)
);

CREATE TABLE Airports (
	Code	TEXT	NULL	PRIMARY KEY,
	Description	TEXT	NULL
);

CREATE TABLE `Air Carriers` (
	Code	INTEGER	NULL	PRIMARY KEY,
	Description	TEXT	NULL
);

### User's Query:
Please list the destination cities of all the flights that were cancelled on 2018/8/1.

### Extra Knowledge:
destination cities refers to DEST; cancelled refers to CANCELLED = 1; on 2018/8/1 refers to FL_DATE = '2018/8/1';
SELECT DEST FROM Airlines WHERE FL_DATE = '2018/8/1' AND CANCELLED = 1 GROUP BY DEST