Can more than one actor (excluding the system) participate in the main flow of events in a Use Case?

In the main flow of events, a Use Case typically describes the interaction of a single actor with the system to achieve a goal. However, in some cases, more than one actor (excluding the system) may participate in a single Use Case if their actions are closely related and jointly lead to a result.

For example, in a ticket booking system, both the customer and the support operator may participate simultaneously, interacting with the system within a single scenario.

It is important that such a Use Case reflects the joint behavior and interaction of the actors, rather than simply combining several independent scenarios.