Hello this.to.firstName,

We haven't formally met yet, but I would like to introduce myself. My name is this.fullName and I'm in charge of project.name at company.name. referral.name suggested that I get in touch, as I've been working on a project that might be interesting to you.

Would you be interested in grabbing a coffee sometime next week? How does
work for you?

Alternatively, feel free to propose a few other days/times that work better for you and we'll make it happen.

Looking forward...

this.firstName