Dear...
Just a quick note to let you know that I really enjoyed speaking with you on the phone __(last night/yesterday/the other day/etc.)__. Thanks so much for the call. It was great to be able to chat with you and get more acquainted with each other. Conversation seemed to flow quite easily between us. I must say that I’m very intrigued by you, __(Name)__, and am looking forward to getting to know you better.
Emailing with you has been a pleasant experience so far and now I have a voice to put to that email name. I like the sound of your voice and look forward to our next telephone conversation. In fact, I would even be open to meeting you in person at some point. What are your thoughts on that? Perhaps we could get together for __( coffee/dinner/a walk/etc.)__ sometime?
Anyway, I hope __(you’ve had/you’re having)__ a great day. Till next time…
Cheers!