please check this paragraph. Thank you

I received an urgent call today from Mary of AB Company saying that they needed to schedule an appointment with my boss next Tuesday. I told them that I would need to check the date with my boss first to make sure he was available. I agreed to call her as soon as I had talked with my boss.
Hello again.
Again, there's nothing wrong with your paragraph but I'll suggest some changes. Emphasis in CAPS.

Mary of [or FROM] AB Company called [or phoned] AT 2 PM today, asking to schedule [or ARRANGE] an urgent appointment [or MEETING] with JOHN JOHNSON next Tuesday. I said I would check with JOHN and call her BACK as soon as POSSIBLE.
Thank you for your help, teacher.