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The initiation of the dialogue occurs via a keyword.
The initiation of the dialogue occurs via a keyword, namely, either ``Fahrstuhl'' or ``Aufzug'', that the user has to be aware of and utter. There is also the possibility to skip the second and third state and go directly to state 4, if the user uses the keyword and makes a travel request at the same time. This possibility is defined separately from the single keywords in the recognition grammar. It is only an added feature for quicker interaction for the people familiar with the system.
When one of the keywords is recognised, the elevator asks in German ``Which floor do you want to go to?'', which corresponds to transition 2-->3 in the model. By that, the system is set to the state of expecting an answer, which corresponds to state 3. The answers are all in the recognition grammar of the speech recognizer and they include numbers of floors as well as descriptions that can be mapped onto floor numbers, e.g. names of professors that sit on that floor. Turns are strictly defined: The elevator prompts for information, the user answers, the elevator prompts again, and so on.
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