Even if Khan had never seen the Niqols, the words he spoke confirmed his identity beyond a shadow of a doubt. Khan had finally met Deni, Liiza's father, and that first impression was undeniably good.
Warm presence aside, Deni looked quite kind and composed. His request didn't sound like an order at all. None of his words had tried to claim any authority over Khan.
Also, Deni had addressed Khan with utmost politeness, even using his title and acknowledging his married status. It seemed Khan wouldn't have to fight to gain Liiza's father's recognition.
Ultimately, Deni was only a third-level warrior. Khan could effortlessly see right through him, spotting his genuine character. If Khan had to guess, he would bet that the whole reason behind Deni's presence boiled down to a father worried about his daughter.
Still, that kindness and good impression couldn't solve the main problem.