Yes, you can easily cancel the Ryanair booking. Explore Ryanair's cancellation policy which generally does not allow refunds for canceled flights unless required by law. Passengers can request changes to their booking, such as dates or names, for a fee. Contact Ryanair customer service & talk to live agent & make all possible changes to the flight.
https://www.getlowfare.com/blogs/can-i-cancel-a-ryanair-ticket-and-get-a-refund