this is an example for it 

Dear Mr unknown,

We are pleased that it is you first time to work with us. As you know that we communicate with non-english speakers, so you have to know a bit of strategies to communicate with them politely. (1).(2).(3).(4).(5).  Please pay attention to the mentioned points i want you to sound friendly with them. I hope you have a nice journey with us in the company.

Many thanks,

(Your name)