Choose your answer: is the following review positive or negative?

I would love to be able to give this place a positive review for its food, but unfortunately since I never got to try it, I won't be able to. Indaba really let me down in the simplest of ways. I called on a Wednesday evening to make a reservation for the upcoming Saturday. I made sure to repeat my request for a table for 8 people, at 8pm on Saturday evening several times to ensure that the lady I was speaking to got it right. Imagine my surprise when I turned up at 8pm with 8 people on Saturday night and there was no table for us! The host and hostess initially felt quite strongly that we were responsible for the miscommunication over the table booking, despite the fact that in the booking book, the lady had got not only the date for the reservation wrong, but my name, my phone number, and the amount of people my table was for! I was really disappointed as I think it's pretty fundamental that a restaurant should be able to take a booking over the telephone correctly - but they hadn't got one single part of it right! Customer service is such an important way of building up and maintaining a loyal customer base, and had the owners of this restaurant managed to overcome their error in a suitable way, they may still have salvaged their reputation with myself and my group of friends, however, everything about this experience was quite unpleasant and it really makes me reluctant to give this place a second chance, which is shame as I was really looking forward to trying it. Not only did Indaba lose out on a big booking on Saturday night, but they also have lost out on our future custom, and the future custom of family and friends, who are keen to take all recommendations I can give them for good places to eat in Edinburgh. Shame.

Options are:
(a). negative.
(b). positive.
(a).