People appreciate it when you keep them in the loop.
John is meeting up with Jack in 10 minutes to work on a group project.
John wants to get some food before working.
John tells Jack then he needs to push the meeting back, so he can get some food first.
John decides to stop and eat some food before meeting without telling Jack and arrives an hour late.
The two agree to meet at a later hour as Jack thanks John for letting him know.
Jack scolds John for making him wait an hour with no advanced notice.