Model letter to Agony Aunt

I am a French teacher of English and am currently preparing an etwinning project based on exchanges of agony aunt letters so was interested in reading what is done for French-learning students. I enjoyed your activity, hower I feel that I should point out that the phrase 'agony aunt/uncle' does not exist in French. So no such letter would actually begin with 'chère tante' unless of course it were written to a real aunt.