Change voices of a brief recorded audio conversation

Hi, I'm doing this for other people and they say I'm really good and you can be sure I'm very experienced in this field. My usual price is 60$ per up to 1 hour of edited audio, but it would be better if you provide your files to see how difficult it will be and also I'll make a sample for you to see how I'm doing it and to decide to hire me or not. The sample will cost nothing.

Ciao, mi chiamo Christian, compositore e freelance mix engineer. Quanto dura il video esattamente? Saluti, C

Hi, I am a qualified translator, originally from Italy, I'd like to help with the voice change for the conversation mentioned in your ad. I look forward to providing you with my professional services. Best, Tiziana

I'm an italian and I can available for this job. In case that you approve my proposal you can send me all information about this activity

I'll be frank and tell you that this is a relatively easy job. I can do this under a day. Anyone that charges you more is daylight robbery. I've done research about formant structure and manipulation of formant is pretty easy with the right tools.