Ask your partner about the worry behind the repeated question.

A question asked over and over is rarely about its own subject. Checking again whether the tickets are booked, whether the money is fine, whether you remembered the appointment is usually anxiety looking for somewhere to land, and answering the surface question only settles it until the next round. The reassurance never quite reaches the thing that needs it.

Next time the same question comes back, try asking what is worrying them underneath it. Then listen without immediately solving. Naming the actual fear tends to do more than the tenth confirmation that the tickets are indeed booked.