Dear Felix
Thank you for your letter to Mr. Johnson regarding your observations and suggestions. Mr. Johnson appreciates your comments and has asked me to respond on his behalf.
Your ideas for (list ideas) are very much appreciated. Our development team welcomes unsolicited recommendations such as yours. We discover many of our most popular features are a result of comments from our customers. We are always grateful to hear from you and encourage you to pass along your thoughts.
Your patronage and continuing goodwill are very important to us. We look forward to serving your future needs.
Regards
Lydia