Control over salutation and signature

At the moment, the OpenAI GPT feature adds a salutation and signature to every message. Even when a signature is already set up on the account, it's still adding a signature at the end of the message. 

Also, in Dutch, the salutation starts with 'Beste' (Dear in English) which for many brands sounds somehow formal, and often they use other things like Hi or Hallo. Also we would like to have control over if the full name, first name or last name get's used for this.

The signature is something that simply has to go and makes no sense to have this here, but over the salutation and the way conversations are started we would like to see some more control. Directly after the salutation, GPT also always opens with 'Hope you are doing well'. For me as a Dutchman, this is somehow weird to have in every conversation as we have a more direct way of communicating. It would be good if we could have more control over this as well.