There are a few examples of people who were about to die by suicide when someone asks how they are and if they need a bit of help.

it doesn't take much to stop most death by suicide.

“There are many causes for a suicide, and generally the most obvious ones were not the most powerful. Rarely is suicide committed through reflection. What sets off the crisis is almost always unverifiable. Newspapers often speak of 'personal sorrows' or of 'incurable illness.' These explanations are plausible. But one would have to know whether a friend of the desperate man had not that very day addressed him indifferently. He is the guilty one." —Albert Camus, The Myth of Sisyphus