When defining an utterance, you can map multiple slots to the utterance, or none of them at all. The bot will then map the slots to the entities that they represent. For example, you can map the number of rooms required to the built-in slot types of night, date, and room type. Then, you can map additional slots to the utterance from the Slots or Uterance tabs. Once the utterance has been defined, you can then add slots by typing their name.
A slot is an entity that contains the data paths and operation issue machinery of an instruction. It’s a common term in the VLIW world, where the pipeline to execute the instruction is separated into several slots. In addition to providing a way for the slots to separate out their components, they also have global attributes that are independent of each other. For example, a named slot is a single element with a name attribute, which is a special case of the normal slot.
When you purchase an airport slot, you’re granting that airline the right to operate at the airport during a certain period. This time is often used when parking space and runway throughput are at a premium. These slots can be traded, and they are very valuable. In fact, one airport slot was sold for $75 million in 2016. Similarly, air traffic management slots are issued by the EUROCONTROL as part of its capacity and flow management role.