You shouldn't make excuses.
David needs help moving and asks Janie for help.
Janie wants to go to a concert on the same day.
Janie helps David with the moving process.
Janie tells David she's sick and goes to the concert herself.
They finish early and Janie gets to catch the second half of the concert.
Janie loses a friend because David sees a picture of her on social media at the concert.