Answered: 
Hello, my name is Maria calling from <COMPANY>. I’m calling regarding an order placed on <date>. May I please speak with <customer name>?
I need to let you know this call may be monitored or recorded for quality assurance purposes.	

No Answer:
Hello, this is a message for [CUSTOMER NAME]. This is [YOUR NAME] with [COMPANY]. We need additional information to complete your order placed on [DATE]. Please call us at 800-282-4200 and refer to order number [ORDER NUMBER]. We’d like to hear from you by tomorrow. Thank you.