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Turn-taking.
System: | Which floor do you want? |
User: | (no input) |
System: | I'm sorry I didn't understand you. Please specify a floor number, a person or a department you want to visit. |
The elevator prompts in a more elaborate way when there is no response by the user after a pre-defined amount of time. It gives information on what kind of answer is expected.
Current state and possibility of extension: See Section 2.4.2. See also description of elevator, Section 2.3.
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