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When creating a bot using Power Virtual Agents, the feature that helps initiate action based on user queries is trigger phrases. Trigger phrases are specific phrases or keywords that users might say or type to engage with the bot and indicate their intent. When a user inputs one of these phrases, the bot recognizes it as a cue to execute a specific action or respond accordingly.

For example, if a user types "I want to book a flight," that phrase could be set up as a trigger phrase to initiate a series of actions related to flight booking. This capability is fundamental for enabling a conversational flow where the bot can understand and react to user input effectively.

The other features play different roles: responses provide the actual replies the bot gives to users, failed query logs track instances where the bot could not understand a user’s request, and analytics helps in understanding the overall performance and engagement of the bot but do not directly initiate actions based on user queries.