Reconfirm
/ˌriːkənˈfɜːrm/
Definition 1 of 1
Pro Tip 1/3Uncertainty Reduction
Used when previous confirmation is doubted or when circumstances might have changed. 
He decided to reconfirm his hotel booking after the recent storms.
Pro Tip 2/3Prior Confirmation
Implies that there was an initial confirmation that is being checked or assured again. 
She needed to reconfirm her attendance to the event due to the confusion.
Pro Tip 3/3Professional Context
Commonly used in formal settings like business, travel, and events to prevent misunderstandings. 
Please reconfirm your meeting time with the client for next week.