Can you find an excuse for me?

Hjkkk
I'm in the security business of a site. 4 people work during the day, 4 people work at night... We are the rest days of those who are daytime... The thing is, let me give an example, a friend who works during the day gets a job, and one day they change their rest days with another friend...
To get to the point, a friend of ours during the day doesn't change his rest day with anyone, I heard that the patient is working today, if nothing goes wrong, I'm off tomorrow... What excuse should I find if he tells the manager, "replace me with him"? Not to change? There is no such thing for now, but what if?
Can you find an excuse for me?
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