I'm trying to find a way to retrieve the first conversation/interaction for an external contact.

I was looking at /api/v2/externalcontacts/contacts/{contactId}/journey/sessions but, if an external contact has had hundreds of sessions in the past, I realize this will take a long time to paginate through.

Is there an API that I'm missing that would contain a contact's first conversation? Has anyone run into a similar issue/found a solution? Thank you!