U.S. stock index futures pointed to a slightly higher open on Thursday, as investors tried to shake off concerns surrounding the U.S. administration and switched focus to the monetary policy symposium at Jackson Hole. Thursday marks the start of the 2017 Economic Policy Symposium on "Fostering a Dynamic Global Economy" at Jackson Hole, where leading central bankers are set to meet. Over the three-day event, Federal Reserve Chair Janet Yellen and European Central Bank President Mario Draghi are both set to speak, with investors watching the event closely for any indications when it comes to monetary policy outlook. In data news, jobless claims totaled 234,000. Existing home sales data are due at 10 a.m. ET and the Kansas City Fed Manufacturing Survey at 11 a.m. ET.