Inquiry Submission By Flowermom

Trying to book international airline ticket on Cambodia Angkor Air. Website asks for Middle name and then Given name (assuming they mean First) in same space. Family name is entered in a different space. We are concerned that by doing so, our ticket will not match our passport which has our Given name before our Middle name. Would this be a problem for obtaining our boarding pass or going through customs & immigration? For those of you who’ve done this before, how did you list your names? Thanks!