Answer:
He asked them what plan they had for the next session.
Step-by-step explanation:
Indirect speech is a reported speech. The tenses of the sentence are rephrased so as to denote speech that was made in the past. In the sentence above, the speaker asked a group of people what plan they had for the next session.
That is a question that would be rephrased as such and in the past tense when reporting the speech.