How to set whatever user input will run an action in story

I want to set a flow like this

story.yml

- story: On connect with customer service
  steps:
  - intent: greet
  - action: utter_welcome_message
  - intent: help
  - action: utter_what_help
  - intent: whatever_user_input
  - action: action_connect_customer_service

Before user connect to customer service, i want to send a message “How can i help you” first, and then whatever user type it will run an action

How to define this intent whatever_user_input in nlu? Do i have to give examples as much as i can predict user input?

domain.yml

utter_what_help:

  • text: How can i help you?