Megan: hello, are you up for some cycling today?
John: no not today but maybe tomorrow?
Bob: yeah tomorrow is better, maybe around 5 pm?
Megan: so you are both busy today?! Are you doing something without me?
John: i am going to the dentist, wanna join? haha :D
Bob: lol me too :D what a coincidence
John and Bob are both going to the dentist today. As a result, they can't go cycling with Megan.