Does this sentence – "We will reply you after discussion with my manager and/or head of department" conveys that –
1) I am writing from the executive's point of view i.e. I will reply to you after discussing with my manager ; OR
2) I am writing from a superior's point of view i.e. I will reply to you after discussing with MY manager….
Best Answer
"My" can go either way in chain of command contexts - master and servant might with equal propriety refer to each other as my servant and my master - but without further context "my manager" or "my supervisor" invariably points upward in standard English.
Outside the scope of your question, but I would try to avoid replies which cast you in the role of a supernumerary. You might try asking your manager what she thinks an appropriate reply would be, then reply on your own authority. If inquirer wants to elevate to your manager then you know they will get the right answer - and be less likely to doubt you in the future.