No Clientletter or project name for Visa Interview

1)My Employer just provided i797 and support that they didnt mention any project name.when i ask them about client letter they told you can tell working for company project,but they didnt mention project name in the letter,is it correct ways of answering.
Can anyone please suggest me?

You can use your offer letter stating the job role, duties, project details and location if you already have it, otherwise request one from your HR.