They will offer water to interviewees.

They rejected me simply because the chairman said I was unsuitable, which I found very disrespectful.

You were hiring a reservations specialist and called me saying that, because I had food and beverage experience, you wanted to invite me for an interview. Before the interview had even ended, you said I was unsuitable without giving any reason. You said it was because I had not worked in front-of-house service. Do you realize that a front-of-house server and a reservations specialist are very different? Did you explain your supporting arrangements and procedures? I also told you on the phone that I had no experience in this area, and you said that because I had worked in food and beverage, I might learn about the menu more quickly. That was why you called me. Please confirm the position you are hiring for in the future, including the required years of experience. Do not waste each other's time. Having more money or a higher position does not give you the right to treat people so disrespectfully.