This question comes from my wife Alice (her English is even worse than mine).
In the middle of the day, my wife ("Alice") goes for a walk in the park with our 2 months old son, and a dog.
There are other dogs and children in this park; they are not a problem. But there are also elder people (around 70 years old), and many of them are feeling lonely and need a conversation.
But the problem is that they act a bit awkward: saying such things like:
"let me play with your dog".
"your baby may be cold/exposed to sun/whatever".
The answer to both is "no", which seems to be a not very polite way to end a dialogue, and there's really nothing to talk about.
How can Alice prevent this before it starts, or answer, so that no one feels offended?