How to handle Fallback Loop in DialogFlow?

Question

There are two loops here:

1. Re-prompt from DialogFlow when user is not entering correct value for slot
   eg.

   Bot: What is color of your car?
   User: potato
   Bot: What is color of your car?
   User: tomato
   Bot: What is color of your car?
   ...

2. Getting fallback intent replies from DialogFlow
   eg.

   Bot: What is your car brand?
   User: red
   Bot: Sorry, could you rephrase.
   User: red red
   Bot: I did not understand, could you say it again.
   ...

How to come out of these scenarios? There is no provision of setting number of re-prompts.

Thanks to @Abhinav, I got one approach of using outputContexts to solve this issue, however I am getting many cases to get this working as described in below pic:

But I am getting confused whether I should increment the counter or decrement it. As output contexts also gets decrement with every call.

Answer 1

You need to maintain that by yourself. For Action on Google you can look into following example https://developers.google.com/actions/assistant/reprompts

For Dialogflow:

• Create a parameter, "re-prompt"
• Check it in fallback intents.
• increment it in fallback.
• reset or decrement it in other intents.
• if it is greater than 2, you may exit the conversation by letting the user know that you are unable to process at this time.