It's often useful to personalize a message using an [attribute](/v1/user-manual/crm/custom-attributes) from the user's profile. You can insert attributes into [messages](/v1/user-manual/inbox/the-inbox-view), [saved replies](/v1/user-manual/inbox/saved-replies), [automessages](/v1/user-manual/automation/automessages) and [campaigns](/v1/user-manual/automation/campaigns) by typing `#` anywhere in your message. When you press `#`, Pavior suggests the available attributes from the CR. For instance, you might begin a message with `Hi #firstName` to dynamically substitute the user's first name.In the support inbox, the attribute will be immediately replaced by the actual value. In saved replies, automessages or messages tailored for campaigns, where the audience typically extends beyond a single user, Pavior provides an option to select a fallback in case specific users lack the designated attribute. For instance, if you choose `#firstName` for a message like `Hi #firstName`, you can set `there` as the fallback value. This ensures that the message is sent as `Hi there` in cases where the `firstName` attribute is not available for a particular user.