Can't get response of the interactive avatar

Hi guys,
I am creating a new session for the interactive avatar and calling the function speak with tasktype.CHAT, all works fine but I cannot find a way to get back the answer of the avatar. How can I get the answer to my script?

const response = await avatar.speak({
text: text,
taskType: TaskType.CHAT, // Utilisation du mode CHAT au lieu de REPEAT
});
console.log(response);

I already tried to display the response but I get something like that:
{task_id: '685ec20f-d855-11ef-9640-72615a2b266a', duration_ms: 0}

thx