Update 18.3 Online booking system Royal Thai Embassy. Do not know what to tell, the system works as designed... If you have a problem with your booking please contact support@thaivisavientiane.com , mail account is now working. I also have noted that slots for the 9th, 10th , 11th and 12th April are available. However I noted that every 1-2 minutes one slot is taken. For the 9th, at 14:00 still 108 slots free, now at 17:06 all slots are taken. I guess, whoever manipulate the system will continue now with the 10th and 11th of April.