Conflict Without a Process

Page 287 of the textbook says that conflict is a process rather than an isolated event - Conflict usually arises over the course of time instead of being focussed on a single occurrence.

The textbook may be correct for a majority of the cases when conflict arises, but I feel that there certainly may exist cases when a conflict arises due to one event. I don't have a concrete instance that I can quote from my personal experience, but can conjure up a hypothetical example to support my view:

In an organization, most employees have customers who are also part of the organization. If an employee does not satisfy a customer's demand that was perceived as vital by the customer but not the employee, then a conflict may brew based on that one occurrence. The implicit understanding made by the customer is that the person serving him or her will satisfy the demands, but when that tacit promise is broken, then that could sow the seeds of the conflict - and may be based on a single event.