Sri Damansara Club

In a humid and boring mid-afternoon, a friend of mine named Crystal asked me to go for a swim with Sin Wei who is an ex-student of mine at 7:00pm at Sri Damansara Club.
But earlier before that, I had promised my parent that I will be having dinner with them at the very same time, 7:00pm and later on after 2 hours I will be following my mom to JUSCO to do groceries. Therefore I could not make it up to her.

In this case, The Causal Relationship is used.