User Input Task

I have a flow where the values for user input task is getting from parents flow. For the user input task there are multiple users for Assignment. So I want one instance of node for each assignee and store every values for each values that assignee has given in user input task. 

right now i have configured like this

But I am getting values for only the first user using user input task. 

Suppose there are 3 users. If user1 picks up task first and submits his value is stored. Then user2 and 3 picks up task and submits, their value is not getting stored. 

Can anyone help me with that?

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