أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
Politely advise the customer what you are capable of delivering and let him/her know that you do nit promise what you cannot deliver
You need to advice the customer what you have.
Be truthful with the customer & give an example that we made the best choices we could in some cases but in this case this order is not useful for you as an advice if he still insists offer him another choice similar to his requst .