Since the time of shipment can not be fixed, I can not help but worry about it.
交货期还没定下来，我怎么会不着急呢？

I'm sorry to tell you that we are unable to give you a definite date of shipment for the time being.
很抱歉，现在我们还无法告诉您确切的装船日期。

Can you effect shipment of the order in March?
您看这批货能在3月份装运吗？
 
Is it possible to effect shipment during October?
能不能在10月份交货？

I want the goods to be delivered in June.
我希望你们能在6月份交货。