You can create a new conversation in a couple of ways learn more below:
Click on the plus icon next to the search bar in the top left of the chat view.
First, type in the number you wish to chat with. If the number already exists, you'll be prompted to choose the candidate and then be redirected to the existing conversation.
If the number doesn't already exist, you'll be prompted to enter contact details for the new contact.
Once you've filled in the contact's details, you can also add marketing data such as the source of the contact and which job location the contact is to be associated with: