The federal government's Smart Traveller service has issued a warning to Australians stranded overseas after reports scammers are targeting them by offering flights home. A post on the Smart Traveller website said Australians were being contacted by someone claiming to be from the Department of Foreign Affairs and Trade (DFAT), offering flights and requesting credit card information. "DFAT will never request payment over the phone. If you receive a call from someone claiming to be from DFAT seeking payment for one of these flights, please hang up," the post warned. There are more than 34,000 Australians stranded overseas, unable to get home due to the cap on numbers in hotel quarantine.