I tend to get in trouble when talking about dialects, as I don't really have the background or, indeed, real knowledge (I know more Classical Japanese than Kansai-ben, for heaven's sake), but my understanding is that there is a range of pronunciations of the -ô ending, including -ee/-ei shading into an -ai sound. But it could be entirely possible those are intended as arigatai? Dunno.

(Sorry for romaji but this keyboard's not set up for kana input.)

---L.