try asking him during your first conversation. just casually work it into the conversation and ask. and towards the end of the conversation ask him how to properly say thanks and such, i'm sure he'd appreciate that more than you pretending to know japanese.. by reading someone's reply word for word.. ahri gahto gohzah hi masoo.. terrible..
and while english rendition of japanese (i can't remember what they call it.. totally drawing a blank here..) looks good typed, from my japanese class experience, most novice speakers end up butchering the hell out of the language, even w/ proper native speaker guidience.