The double yes
A second hello takes two yeses.
A good conversation can end right there. If you’d like another, the host can handle the part that’s hard to ask out loud.

How the double yes works.
Give the host your answer privately
On your way out, say “I’d take a chair with her again.” Keep enjoying the conversation without negotiating phone numbers at the table.
The host checks for two yeses
Only when both people independently ask does the host offer a time to meet back at the same table. A single yes stays private.
Choose again next time
Plans change. You can take a different chair, meet someone new or skip a week. There’s no standing obligation to return.