Are you available to work days, nights, weekends, and holidays?

Yes, I will be available in all the shifts whenever you need me. The only concern I have is to let me know the plan of my work before a couple of days so that I can prioritize the other things accordingly.

Note: You have to understand that such a job requires you to work on holidays and some of the time. So make sure you are not saying NO here, if this is a concern for you then this is not the right job for you.