I'm guessing you're a programmer?
Are you booking a flight for one date in Bangkok? That sounds expensive. If I have to take a plane for my first date, I personally wouldn't do it. Why would I spend $100+ on a plane flight for 1 date?
If you have a company business trip in Bangkok, then go to Bangkok and maybe casually date someone. But I would not recommend you dating someone from another country. That's kind of problematic.
Generally you need to be honest with women. If you are casually dating more than one woman, then you ought to tell them that you are casually seeing many women. If you don't tell them that, you are cheating. I personally am ok with taking 2+ girls out for about a month. After that, I'll pick whichever one I'll want to date, and I won't pursue the others.