I was able to get in touch with the electrician within 1 day. Although they said they were busy, they were able to give me a service appointment within 1 week. Alex came to my home promptly and did a great job installing a chandelier, and fixing the installations of two other ones (including re-installing a loose junction box) within a reasonable time. He was very friendly and informative, and the rate was fair.
Would definitely call them again for further lighting services.