Host: “Hello. How many?”

Guest: “There’s three of us”

Host: “OK. The wait is about half and hour”

Guest: “OK”

Host: “Let me have you put your number in here and we’ll give you a call when your table is ready”

Guest: (puts in their number) “OK, so you’ll just call me?”

Host: “Yep, we’ll give you a call when it’s ready. Thank you”

Guest: “Thank you”

When the host gets to their name on the wait, she calls their phone (as promised). No answer, but she thinks she hears someone’s phone ringing at the bar. She calls again. She heard correctly. It was their phone. They had gone to the bar and decided to stay and eat at the bar. They were already eating their food when she spotted them ignoring the phone call.

I believe what you meant was:

Guest: (comes back up to the host stand after 15 minutes) “We decided to just eat at the bar, so you can take us off the list.”

Host: “Thank you for telling me. Enjoy your dinner”

Guest: “Thanks so much”

If you have to sign in, which involves giving your name and phone number, after which you are told you will be getting a phone call, please respect the host staff’s time and effort. It’s someone’s job to take care of you and get you seated. Host’s aren’t mind readers. Nor do they have eyes in the backs of their heads when the room is packed. They got the information from you that they needed to do their job. When you walked away from the host stand it became  your responsibility to let them know of a change. They have everyone in the room to deal with. So, before you let them just go ahead and plan for -your- table, get it ready, specifically for -you- and -your party’s- needs and call you multiple times just to end up watching you ignore them, please, let them know not to bother.

The same goes if you decide to leave and not wait for your table. You have to walk right past the hosts when you leave. Tell them you’re leaving. Just tell them you’re leaving. You’re probably going to literally bump into one of them on your way out. Just tell them. Just tell them you’re leaving. You can’t be bothered? You can’t just take a second for common curtesy? Let me paint a picture for you:

One of the hosts is going to stand there in the middle of a crowded room with people everywhere (and ten other things they could be doing, instead) and listen to your phone ring which is stuffed inside your purse and you’re already back in the car with your friends and the music is up and you’re completely unaware.

You just can’t be bothered to not do that to someone?

OK. Cool. Thanks.