How can I design the flow if the next intent is relates to the previous? e.g

I’m trying to integrate Dialogflow ES into my website Chat portal (live helper chat).
i use REST API to pass user input to the DialogFlow system.

I’m a university student majoring in computer science. Please forgive my limited experience as I’m still in the early years of my studies.
I’m currently working on a final project to develop a chat-bot using Dialogflow ES.