I want to link Rasa with questionnaire platform so that user fill that and afterwards i want to fetch that information to apply further processing on it
The questionnaire platform is like google form, Microsoft Forms or is it your questionnaire platform?
Like Google form or jot form
I believe isn’t possible. Rasa don’t have google form, jot form or some other third party plugins native integration 
I think the simple way is build a form using Rasa Forms
Or… you can try something more complex build your form using HTML, JS, CSS with integration rasa REST API webhook ( POST /webhooks/rest/webhook)
Wait for some other comments because in this moment, I just seeing this two way you can go
Thank you so much for helping me out.