Hello, can anybody please suggest in the following issue? My uncle got tourist visa based on my invitation letter, which says he will stay with us in Chiang Mai for his entire trip. His flight is from Calcutta, India to Chiang Mai via Bangkok. However, now he has changed his mind and would like to spend some time in Bangkok before coming to Chaing Mai. Will that be a problem, as his plan for Bangkok trip has not been mentioned in the invitation letter. Any suggestion will be much appreciated.