"Conversational tone" means speaking or writing in a casual and relaxed way, similar to how people talk when having a friendly conversation. Full definition
As such, we both talk to the dogs in conversational tones as we're doing things throughout each day. (pethelpful.com)
Websites with more conversational tone added phrases such as «Let's move onto the next question» and «OK, let's talk about exercise» during the question and answer session. (sciencedaily.com)
I really like the new conversational tone of your emails. (theinspiredroom.net)