A Florida pizza delivery service went beyond the call of duty when he agreed to help check up on a missing grandmother in the wake of a hurricane.

Nebraskan man Eric Olsen said he became “extremely worried” when he was unable to contact his Florida-based grandmother Claire Olsen, 87, in the wake of Hurricane Matthew, ABC News US reports .

"We didn't hear from her for two days,” he said.

"I was calling the police department, I was calling the sheriff's department, and no one was answering, so I was really worried.”

After emergency services failed to quell his fears, Mr Olsen turned to a local pizza shop.

He placed an order on his grandmother’s behalf and left special instructions for the delivery person to call him once the food had been delivered.

He then received a call from a delivery driver, confirming that his grandmother was alive and well.

Mr Olsen said hearing his grandmother’s voice on the phone left him feeling “relief, absolute relief”.

"Police and fire couldn't do it, but Papa John's got there in 30 minutes and put the cellphone to her ear," he said.

His grandmother later told local news station WFTV that his choice of pepperoni pizza was “fantastic”.