Here to help.

Panicky woman on phone:
"My son is visiting you today, could you please pass him a message?"

Me, expecting an emergency:
"Of course, who do we need to ask for, and what is the message?"

Panicky woman on phone:
"He's XXX and the message is - Call your dad and tell him to pick your mum up at 2.30pm, same place he dropped her off, because I'm almost done shopping and I left my mobile phone in dad's car. I can't remember their mobile phone numbers you see, but found your number and knew you'd be able to help."

Me:
".... we'll bing bong for your son, and let him know..."