Whether you or your customer need to cancel a scheduled job/estimate, you can easily do so in the web portal.
Canceling will automatically send your customer a text and email notification to confirm the cancellation (if the customer notifications are turned on).
1. Open the job or estimate details page
2. Click on the gear & wrench icon
3. Select 'Cancel job' from the drop down
4. Click 'Yes, cancel this job' to confirm
The checkbox next to 'Notify customer' will default to the customer's notification settings