8. The method of claim 7 , further comprising: modifying the simulated user input based on the performed action if the performed action does not satisfy the pre-determined goal; determining a second simulated belief state of user intent based on the modified simulated user input; performing a second action based on the second simulated belief state and the policy parameters; and outputting the policy parameters if the performed second action satisfies the pre-determined goal.
9. The method of claim 8 , further comprising: determining a partially observable Markov decision process (POMDP) reward score based on the performed actions; and responsive to a determination that a policy threshold is satisfied based on the POMDP reward score, outputting the policy parameters.