Very different to Malaysian/Singaporean/Chinese's "la" or "lah" which they use at the end of the sentence to sound more Asian/Chinese but Bhutanese use it to show respect to the other person, especially elder/higher people.
Dad: "Do you have any GF, son?"
Son: "No, la"
Dad: "Khai"
Different than Malaysian/Singaporean's "lah".
It's a Bhutanese language and are used after sentences to show respect, especially to someone elder/higher to us.
Dad: "Do you have any GFs?"
Son: "No, la"
Dad: "Khai"