I am American, currently nearing the end of my first extension of stay (permitted up to 20 Nov 2019) based on O-A retirement visa obtained in USA. I'm planning to go to Savannakhet next week to apply for a Non-Imm O visa based on marriage. Do I need to cancel the current extension of stay at my local immigration office before I go to Savannakhet to apply for the Non-Imm O visa?