When should I drop in a next message when he says "I hope to have another conversation with you" on a dating app?

Anonymous
When should I drop in a next message when he says I hope to have another conversation with you on a dating app?

P. S.: I liked his profile, but I selected for "friendship".

I don't know, maybe that's a necessary information.

Updates
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"I hope to have another conversation with you soon"
When should I drop in a next message when he says "I hope to have another conversation with you" on a dating app?
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