Saturday (My Experience and Things Make Me Disappointed)

Saturday my sister invited by me to go for a walk, he called me the morning before he goes to work, my sister told me at 1 pm, get ready wrote, I'm taking my sister to go to the mall. clock showed 12 noon-hour mean my sister came home from work. My sister called me and said they could not 1 pm because my sister will overtime until 5 pm then my sister told me at 6 we went to mallnya certainly annoyed me, because I already have a schedule to a friend to go to the mall, because I cancel appointments to friends and said I would go with my sister. I was annoyed to my sister because canceling 1 pm to go to the mall to be the time to 6 pm.