Dear John,
I had to leave quickly, because I receive a phone call at the office that my mother was ill. I phoned you, but it was no answer. I supposed you were in a meeting. In the last minute I decided to send you this email and to explain everything.
I booked a ticket on the next flight to my home town and I called a cab to take me to the airport. I have to leave in about 10 minutes.
When you receive this email, please give me a call. If there isn't any answer it means I'm on the plane and I will phone you when I arrive.
Please do not forget to water my plants and to feed the dog. I would highly appreciate if you can take him out at least twice a day. You can find the key under my door mat. It is stuck to it, you will have to turn it upside down.
Thanks a lot in advance for your great help.
Kindest regards
Robert