List users
Get distinct users from conversations with pagination.
Agent id (agent_…) or speech engine external id (seng_), resolved to the same underlying resource.
Unix timestamp (in seconds) to filter conversations up to this start date.
Unix timestamp (in seconds) to filter conversations after to this start date.
Search/filter by user ID (exact match).
The field to sort the results by. Defaults to last_contact_unix_secs.