Dear Sir/Ma'am;
Greetings!
I will be providing the requirements within the specified period with provisions for minor modifications, free of charge. While project is in progress, communication will be open whenever convenient from your end. Also, other additional minor requirements will be provided free of charge. Before submitting the final output, drafts will be sent for approval.
I am looking forward in doing this project with you.
Thank you and best regards,
Gina