Highlighted by Nicola Cerioli
From Interaction design for virtual assistants by Corbet Fawcett
…are most comfortable when they get a response that matches the tone and formality of their request. As designers this means it’s good practice to try and match the ‘chatiness’ and conversational approach of the user. If they’re terse and transactional, provide responses that get right to the point. If they’re a bit wordier and use pleasantries like “please” and “thank you,” give them responses that mirror this tone. This will create a more natural, human-feeling interaction.