It happens to everyone. You have a table mid-order and a host seats a second table in your section simultaneously. Now you're managing two tables who both just sat down and both need your attention in the next 90 seconds.
This is not a scheduling problem. It's a service standard. How you handle the double-seat tells the whole room what kind of server you are.
Step 1: Finish what you were doing. If you're mid-sentence with Table One, complete the thought. Don't abandon a guest who's actively talking to you. Three more seconds to close the interaction does not hurt Table Two. Abandoning it does hurt Table One.
Step 2: Acknowledge Table Two immediately. Walk over, make eye contact, and give them 15 seconds. "Welcome in, I'll be right with you, can I grab you some water while you get settled?" You're not taking the order. You're buying time and signaling that you see them. Most guests will wait patiently for four minutes if they know you're coming. Most guests will be annoyed in 90 seconds if they feel invisible. The acknowledgment is the entire difference between those two experiences.
Step 3: Go back to Table One and close the loop. Finish whatever you were doing. Put in the order, get the drinks started, do what needs to happen for that table to be in good shape for the next few minutes. Don't rush this. A half-finished service interaction with Table One costs you more than the extra 60 seconds it takes to do it right.
Step 4: Return to Table Two with your full attention. Now you're here. Greet them properly, take the drink order, begin the service sequence from the beginning.
Step 5: Ask for help if you need it. If a double-seat happens during a rush and you have a manager on the floor or another server who's ahead, ask them to greet one table on your behalf. Asking for help when you need it is not a sign that you can't handle it. It's a sign that you're managing your section instead of letting it manage you. Servers who never ask for help and let two tables suffer for it are not heroes. They're people who prioritized their pride over the guest.
The mistake most servers make in a double-seat is trying to do both at the same time, splitting attention between two incomplete interactions. Neither table feels fully served. Both tables wait longer. Sequential is faster than simultaneous when the tasks require your full attention.
Triage, close loops, ask for help when appropriate.