Consider the following sentences: All actors and journalists invited to the party are late. There is at least a person who is on time.

Consider the following sentences:

A. All actors and journalists invited to the party are late.

B. There is at least a person who is on time.

C. There is at least an invited person who is neither a journalist nor an actor.

Formalize the sentences and prove that C is not a logical consequence of A and B

When I formalize, I find C is a logical consequence of A and B. Can you explain that?