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Optional Question


An Optional Question Node is used to ask a question that requests specific information from the user. The Node can be configured to expect different types of input. As soon as the selected type of data is detected in the user input, the Optional Question Node is answered.

Difference with Question Node

The Optional Question Node is non-blocking. This means that the user will be able to continue their conversation with the Flow if they have not provided an answer to the Optional Question. Before regular Flow execution, the System will check if the User Input answers the Optional Question to find a result. If not, the flow execution will follow a different path.

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Question Types

There are different types of queries that you can use, which are described in detail below:

Type Required user input to answer question
Text Any text input
Yes / No A positive or negative response
Intent One of the trained Intents must be identified from the user's response
Slot A System Slot or Lexicon Slot must be detected within the user's response. The slot is defined by name.
Date Any date (system-defined)
Number Any number (system-defined)
Temperature Any temperature (system-defined)
Age Any age (system-defined)
Duration Any time duration (system-defined)
Email Any email address (system-defined)
Money Any monetary value (system-defined)
URL Any reference/address to a resource on the Internet e.g.
Percentage Any percentage (system-defined)
Regex Any custom data format defined by a regex expression must be detected in the user's response
Data Any data ( input

Supported Data formats for System Defined slots

All data formats supported by the Cognigy NLU for system slot mapping are listed on the Slot Mapping page.

Channels and Output types

Question node output types carry the same functionality as the Say Node.

Date Questions

In case the Question Type Date has been selected, the Question Node will automatically render a Datepicker if the channel permits. Please refer to Datepicker for more information.


The Optional Question Node has four advanced settings that can be used.

Store detailed Results

This setting, when enabled, stores a more detailed JSON object under the result property of the input. This is useful in case more information is needed.

Stop Flow execution after Answer

When enabled, Flow execution will stop after the "On answer" case and wait for another input.

Forget Question Threshold

The difference with a regular Question Node is that the Optional Question Node does not need to be answered. If the Optional Question Node is triggered and no answer is provided, the fact that the question was "asked" is nonetheless kept in memory. With this setting you can decide for how many inputs the the Optional Question should be kept in memory.

Parse CognigyScript

Lets you decide on which user input the CognigyScript after Answer should be executed.

Result Storage

If Store Result in Context is enabled, the Question Result will also be stored in the Context object.

Question Information in Input

When an Optional Question is "active", meaning an answer is being waited for, information about the Optional Question is added to the Input object.

"activeOptionalQuestion": {
    "nodeId": "cb81db3a-6230-49e7-8ce4-12f877abe0cb",
    "type": "yesNo",
    "lastExecutedAt": 1,
    "forgetQuestionThreshold": 3
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