Simon: I'm running really late today. Can you please pick up the kids from school?
Shona: I guess so. Not impressed with this.
Simon: Look, I'm really sorry. It's just that I have to stay back at work to get this project finished.
Shona: ... and leave me with all the crap to deal with?
Simon: No. I'm not bailing on my responsibilities.
Shona: Really? 
Simon: I know we have a deal but sometimes work has to come first.
Shona: It always comes first. Tell me when was the last time that your work didn't come first?
Shona: Every time we make an arrangement your work somehow manages to get in the way.
Simon: Yeah, I know.
Shona: You know that I have other things planned today and if I pick up the kids I'll have to reschedule everything. 
Simon: Yeah, I know.
Shona: Can't you get your sister to them up?
Simon: I've tried to call her but sh isn't answering her phone for some reason. She's probably busy.
Shona: And I am not??!!
Simon: Yeah I know hon. Just this once. Please.
Shona: It is always 'just this once'. Like everyday 'just this once'!
Simon: I'll try to make it up to you on the weekend.
Shona: Promises, promises....
Simon: So can I count on you picking up the kids or do I have to ring around and try to find someone else.
Shona: Yes, but this is the last time I'll do this. I refuse to cover for your lack of responsibility after this. 
Simon can't pick up the kids from school, because he has to finish a project at work. Shona reproached him for being irresponsible. She will reschedule the day and pick up the kids from school.