When two people are talking at a party and the one listening
really isn't. Instead they
'll look around to see if there's someone else they would
rather be talking to. Consequently, even though they
're nodding their head
and smiling, they
're not paying any attention to you.
The same could apply
invitations. A person will accept
an invite and then cancel because they
received another/better offer
to go somewhere else.
"Dude, when I invited
her to go away with
me for the weekend. she said she would
love to. Then an hour later she cancelled saying that there was a party
she wanted to stay in town for. She was totally better dealing me."