All five living presidents and their spouses attended former President Jimmy Carter’s funeral, except for one person: former first lady Michelle Obama.

Carter’s life was celebrated Thursday morning at the National Cathedral. However, the former first lady was noticeably absent, although all other former and current first ladies were present.

It’s not entirely clear why the former first lady was absent. However, Jeff Zeleny, CNN’s chief national affairs correspondent, reports that this was due to an extended vacation in Hawaii.

“Her advisors have told me that she has scheduling conflicts,” Zeleney said Thursday morning. “She’s still in Hawaii.”

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A spokesman for the former first lady said Carter and his family were in her thoughts.

“Mrs. Obama sends her thoughts and prayers to the Carter family and to all who loved and learned from the remarkable former president,” spokeswoman Crystal Carson said in a statement.

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The Independent has reached out to Michelle Obama’s representatives through the Obama Foundation for comment.

Those in attendance included President Joe Biden and First Lady Jill Biden; President-elect Donald Trump and new First Lady Melania Trump; former President Barack Obama; former President George W. Bush and former First Lady Laura Bush; and former President Bill Clinton and former first lady Hillary Clinton.

Vice President Kamala Harris and Second Gentleman Doug Emhoff were also in attendance and sat in the front row with the president.

Obama and Trump appeared to have a lengthy conversation while sitting next to each other before the service began. It’s not clear what they were talking about, but the two laughed.

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Other attendees included President Gerald Ford’s youngest son, Steven Ford, country stars Garth Brooks and Trisha Yearwood, and former Vice President Walter Mondale’s son, Ted Mondale.

Biden will deliver a eulogy for Carter, whom he called a “dear friend.”

“But what I find extraordinary about Jimmy Carter is that millions of people around the world feel like they have also lost a friend, even though they never met him,” Biden said in a statement following Carter’s death. “That’s because Jimmy Carter lived a life measured not by words but by his actions.”

The Obamas also honored Carter in a statement shortly after his death.

“He believed that some things were more important than re-election – things like integrity, respect and compassion,” the two wrote of the 39th president. “Because Jimmy Carter, as deeply as he believed, believed that we are all created in God’s image.”