Phone interviews for volunteers

Hey guys I’m a high schooler and I recently applied for a volunteer position at my local hospital. I give Thursday/Friday/Weekend availability. However the hospital takes months to process the application and I already volunteer every Sunday at another organization. To my surprise (4 months later), I received an email from the hospital resources department for a phone interview to discuss interest in volunteering. I will be calling tomorrow and I’m a little nervous as to what to say. What kind of questions will they ask me, should I tell them I volunteer on sundays now? The other volunteer organization is flexiable and I can try gettiAny help appreciated.

If I get through the phone interview, I then have to go in for an interview.

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