Explanation

Original Statement:

• "Let us have dinner here." → This is a suggestion or proposal.

Indirect Speech Transformation:

• The verb "said" changes to "proposed" (to reflect the suggestive nature).
• "Let us" → "that we" (maintaining the proposal structure).
• "have dinner" → "have dinner" (base verb retained after "proposed").
• "here" → "there" (adjusting for indirect speech).