Hi @Ftapiaj39
According to your description, you want to get the Start date and End date from email to create an event.
I created a simple Flow, you can refer to as below:
The flow is triggered by When a new email arrives, then convert the email body from Html to text.

Expression: last(split(outputs('Html_to_text')?['body'],'Start Date:'))

Get Start Date:
Expression:first(split(outputs('Compose'),'End Date:'))

Get End Date:
Expression:last(split(outputs('Html_to_text')?['body'],'End Date:'))

Create event with Start Date and End Date.

When a new email arrive like this

The new event will be created

For more info about function you can refer to:
https://docs.microsoft.com/en-us/azure/logic-apps/workflow-definition-language-functions-reference
Hope the content above may help you.
Best Regards
If my solution helps, then please consider Accept it as the solution to help the other members find it more quickly.