Grammar fix

meaningful conversation

important talk

a conversation where people talk about real feelings, ideas, or important topics, not just small talk.

collocationB1common

Hear it in context

Notice where the phrase sounds natural.

After dinner, we had a meaningful conversation about our future plans.communication
In my opinion, having a meaningful conversation with friends or family helps to build stronger relationships and understand each other better.IELTS speaking

Pattern: have/hold a meaningful conversation (with someone)

WrongWe did a meaningful conversation.

RightWe had a meaningful conversation.

You HAVE a conversation, not 'do' or 'make' one.

Patternhave/hold a meaningful conversation (with someone)

Choose the version that sounds natural in speech.

Stiff We engaged in a conversation of genuine significance.

Natural We had a really meaningful conversation.

Natives 'have a meaningful conversation'; 'engage in a conversation of significance' is essay-speak.

Words that usually travel with it.

have a meaningful conversation
havea real conversationa deep conversationa proper chat

A 'meaningful conversation' is deeper than 'small talk', which is just casual or polite conversation.