2 Answers

  1. You will never make a mistake or offend anyone by expressing gratitude, but you will be wrong if you neglect this simple act of courtesy.

  2. I'm not very good at etiquette, but it seems that in society it is customary to say thank you just for any offer of help. Even if you don't need it or the promoter is poking you in the nose with a leaflet. Thank you will not be lost.

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