The answer is correct, i hope i helped
Hola Katia! Me llamo Tyler y mi cumpleanos es el veintiseis de abril. Como estas?
Castilian dialect, Spanish Castellano, a dialect of the Spanish language (q.v.), the basis of modern standard Spanish. Originally the local dialect of Cantabria in north central Spain, Castilian spread to Castile. After the merger of the kingdoms of Castile, Leon, and Aragon in the late 15th century, it became the standard language of all Spain and in the following centuries the language also of Spanish America.
Yo estoy would be 1st person since it means " i am" , the person is speaking for themselves about themselves that makes it first person
