If you buy a plane ticket in Laos, it is recommended to use LAK, because it is very common to use LAK in Laos. In addition, buying in local currency can also avoid the cost and loss of exchange rate conversion.
If you don't have enough Laos kip on hand, you can change RMB into Laos kip at the local bank or foreign exchange office before buying. It should be noted that when conducting foreign exchange, you should choose a regular bank or foreign exchange office to avoid being affected by exchange rate or encountering fraud.