Referring to
previous contact • Thank you for your letter of March 15 ...
• Thank you for contacting us.
• In reply to your request ...
• Thank you for your letter regarding ...
• With reference to our telephone conversation yesterday ...
• Further to our meeting last week ...
• It was a pleasure meeting you in London last month.
• I enjoyed having lunch with you last week in Tokyo.
• I would just like to confirm the main points we discussed on Tuesday . . .