Hi @Pushkala,
Please have a look at the related post: Platfrom 8 task and execution listeners - #5 by Chuck_Irvine.
Regarding:
when a user task reaches time out, I need to notify someone or reassign task to someone else.
Currently, Camunda Platform 8 doesn’t support due dates for user tasks.
But you could model a similar behavior in the process. For example, by adding a timer boundary event to the user task and changing the assignee of the task.
Does this help you?
Best regards,
Philipp