Help me create a use case diagram for this use case:

Use case title: Monitor response times of ambulance crews and take appropriate action if response times fall outside established ranges

Primary actor: Dispatcher

Level: Primary task

Stakeholders: Dispatchers, Ambulance crews, Patients, Medical Staff

Precondition: Ambulance Crews are assigned to cases, Dispatchers have access to real-time data on response times and category of cases

Minimal guarantee: Dispatcher can access data on response times and identify cases with response times outside of the established range

Success guarantee: Dispatcher takes appropriate action to address the issue and response times are brought back within established ranges

Trigger: Dispatcher receives data on response times for a case outside of the established range

Main success scenario:

Dispatcher receives data on response times for a case outside of the established range

Dispatcher investigates the cause of the issue, such as traffic or a delay in dispatch

Dispatcher takes appropriate action, such as dispatching another ambulance crew or contacting the original crew to ensure they are on route

Dispatcher ensures that response times are brought back within established ranges

Dispatcher updates the case record with the actions taken and any changes in status

Extensions:

If the cause of the issue is a delay in dispatch, the Dispatcher contacts the relevant personnel to investigate and address the issue

If the cause of the issue is an unexpected delay on the part of the Ambulance Crew, the Dispatcher contacts the crew to ensure that they are on route and taking appropriate action to reach the patient as quickly as possible

If the cause of the issue is due to external factors, such as a road closure or severe weather, the Dispatcher may need to make alternative arrangements to ensure that the patient receives timely care