A booking is an appointment. A party starts at four and an arch built at five is worthless, so a calendar recording only the date rather than the slot is not recording the important half.
Helium can be costed exactly. A cylinder fills a known number of balloons, so the material cost of an arch is calculable rather than estimated, and pricing without that figure means guessing on the largest jobs.
Saturday morning is one route with fixed times. Sequencing deliveries by geography and by start time, and knowing how long each build takes, is what stops the last customer of the day being let down.
Frames, stands and weights are returnable. They leave with a job and come back with nobody watching, and a shop that does not track them replaces the same equipment several times a year.