I am using the Microsoft bot framework to create a bot for questioning the user and then understanding the answer. The user is questioned using the FormFlow API in bot frame
In this situation, it may be best to call a luis intent outside of formflow. The functionality you are looking for does not exactly exist. You could call a "Name" intent then call you form like this:
[LuisIntent("Name")]
public async Task Name(IDialogContext context, LuisResult result)
{
//save result in variable
var name = result.query
//call your form
var pizzaForm = new FormDialog(new PizzaOrder(), this.MakePizzaForm, FormOptions.PromptInStart, entities);
context.Call(pizzaForm, PizzaFormComplete);
context.Wait(this.MessageReceived);
}