I have a mobile app for groceries shopping, the customer chooses the items, specify the delivery address and the delivery time slot.
The times slots are presented as following: Sat 18/2/217 11:00 am -1:00 pm 01:00 pm -03:00 pm 03:00 pm -05:00 pm
and so on for the other week days.
The problem is the customers understands the time slot that the order will be delivered on 11:00 am because he has chosen 11:00 am-1:00 pm and if the order is being delivered on 1:00 pm he sends a message "the order was delivered too late".
How can I make the time slots more clear to customers and make them understand that the time slot means the order will be delivered in the time between ?