My call with a Spaniard.

I called a Spaniard to make my business request.
Because he can speak English, that is our common language.

Before I called him, I prepared a greeting, a request list,
his expected answers (positive or negative), and replies to them.
I thought I had prepared completely.

However, my brain went blank when he took my call.
I could not greet well.　I forgot what to say.
Unable to remain indifferent, he said "I understand your requests.
Please tell me details by e-mail."
I said "Thank you. Good bye." and hung up.

(I was very nervous.) My armpits were sweaty.

Nice work.  Keep it up.

Calling a Spaniard.

I called a Spaniard for a business request
Because he can speak English, our common language is English.

Before I called him, I readied a greeting word, a request list,
the answers I expected (positive or negative), and replies to them.
I thought I prepared completely.

However, my brain had gone blank when he took my call.
I could not greet well. I forgot what word to say.
Unable to remain indifferent (?), he said "I understand your requests.
Please tell me the details by e-mail."
I said "Thank you. Good bye." and hung up.

My armpits are wetting very much now.

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First, let me just say I love how rhytmic this all sounds. It's like a little poem, lovely. Secondly, your English is fine, most of the sentences are easy to understand even with errors. If you have any questions feel free to ask.