Canned responses can be thought of as quick action replies. These are readily available in the Inbox for an agent.
In order to create a canned response:
Go to Settings > General Settings > Canned responses.
Click on Add New canned response.
You can set the availability of the canned response as:
Myself: Only logged in user can see the canned response in inbox messenger.
All members : All the agents can see the canned response.
Members in team: Only members assigned to a team can see the canned response.
You can select an action or multiple actions from:
Add reply : Adds a reply which is entered in the text area.
Assign Member: Assigns the selected member to the conversation.
Assign Team: Assigns the selected team to the conversation.