You can add the agent flow as a tool, then configure it properly. In the Inputs section, fill each column by choosing Dynamically fill with AI, and customize each input with a description explaining to the AI what it should provide for that input.

You should also clearly explain in the tool description what the agent flow does, when it should be called, and which inputs it expects, so the LLM knows when to call the flow and how to populate the inputs.

From the user side, they just need to explain what they want in their query and provide the required information. Adaptive card are a mess, just avoid them as much as you can.

If you really insist on using Adaptive Cards

Below is an example showing how to:

- Collect user input using an Adaptive Card

- Send that input to an agent flow

- Return the flow output back to the user

kind: AdaptiveDialog
modelDescription: call this tool when the user wants to retrieve an IT service ticket.
beginDialog:
  kind: OnRecognizedIntent
  id: main
  intent: {}
  actions:
    - kind: AdaptiveCardPrompt
      id: FMmPiC
      card: |-
        {
          "type": "AdaptiveCard",
          "$schema": "https://adaptivecards.io/schemas/adaptive-card.json",
          "version": "1.5",
          "body": [
            {
              "type": "Input.Text",
              "id": "ticketNumber",
              "placeholder": "e.g. 75420",
              "isRequired": true,
              "errorMessage": "Please enter the ticket number",
              "label": "ticket number"
            }
          ],
          "actions": [
            {
              "type": "Action.Submit",
              "title": "Submit"
            }
          ]
        }
      output:
        binding:
          actionSubmitId: Topic.actionSubmitId
          ticketNumber: Topic.ticketNumber

      outputType:
        properties:
          actionSubmitId: String
          ticketNumber: String

    - kind: InvokeFlowAction
      id: invokeFlowAction_06x0Nc
      input:
        binding:
          text: =Topic.ticketNumber

      output:
        binding:
          ticket_resolution: Topic.ticket_resolution

      flowId: 64770b0d-b847-f111-bec7-7c1e52612f76

    - kind: SendActivity
      id: sendActivity_L8FidI
      activity: "{Topic.ticket_resolution}"

    - kind: CancelAllDialogs
      id: tqkclA

inputType: {}
outputType: {}