Have another nice trip Mr. President.
Check this out:

On Friday, the White House announced that President Obama and First Lady Michelle Obama would travel to South Africa next weeks to pay their respects to Nelson Mandela. Obama has already announced that the White House will fly the flags at half-staff though December 9 in Mandela’s honor.

When former British Prime Minister Margaret Thatcher died, President Obama did not lower the White House flags, nor did he attend her funeral, instead sending ex-Secretaries of State George Shultz and James Baker III. The Sun reported, “[Downing] Street is most angered by rejections from Obama, First Lady Michelle and Vice-President Joe Biden.