Carolyn Condit called Gary's apartment and had a phone conversation with Chandra. Carolyn immediately flys to D.C. with the excuse she was going to a White House Tea. Don't know if anyone checked to see how far in advance she needed to make the reservation without penalty, OR she used Gary's frequent flyer miles. Carolyn hated DC social life, and rarely went there.
Gary tells Chandra he is getting her reservations, but never makes them. He does, however use this reason to lure her to the Park, so she can pick up the fictious ticket. He didn't want anyone to witness them together, he tells her. He either killed her, or had someone else do it.
sw