1-Map your fields and contact details
For existing campaigns:
Check if your contact details/fields are properly mapped:
From your Settings, click on "Contacts" then click on one contact and open the profile details for that contact.
For new campaigns:
Click on the Contacts card , then upload your contact list and map the fields.
When you import a new list of contacts, make sure you map your fields before you upload the list.
2-Write a "voice-catching" introduction
From your Settings, click on Script, then write your introduction and add custom field/intelligent tags by clicking on them, while you are editing.