Dear Sir/Madam,
My name is Arnau. I am from Barcelona, Spain, so my mother tongue is spanish. I currently work for a private US non-profit organization in Indonesia and I am used to do multi-conference calls through Skype with the founder and president of the NGO I work for as well as other directors around the different countries we work in.
I would gladly take part as a translator between you and the other party (spanish guatemala).
I would like to know more about the call, topic, goals, requirements you might have, etc, so we could ensure an smooth conversation.
Best regards