Promise

I am the kind of person that will keep the promise until it is done. So someone asked that whether we should go out for yamca today. I asked for the time. She said need to wait for another person to comfirm. So I said I will contact the person. But no reply yet. Later when she replied, I told A who suggested this meeting at the first place that B said B will call when she is back. Ok, no response again. So at a very late time later, B called and told me that A said she had something on suddenly so may be tomorrow. So, let's say I wait for the whole day for a 'nothing' and I don't think I can wait for a 'nothing' tomorrow. Thanks but no thanks.