Create Request on Incident, you can add one line to UI Action to cancel Incident:

"and create a request ticket with details provided in the Incident form" what details and where do you want to store them? The caller is set in the Requested for field, so to get the other details, the Parent field on the Request is populated with the Incident ticket. You can write a business rule to pull the data over form the Parent (incident) into the fields you want on Request.