hotel ordering system

[sahebalam233]

i have been assigned a software of hotel management for my last semester in college
which needs following requirements
=>when a customer call to order food the system checks if the customer is new or existing
IF new(registers new no, address n details)
IF old (by default gets all info on screen)
=> as soon the customer completes his/her order n keeps the phone (a system generated message should be delivered to customer saying his ordered food order)
=>when the delivery boy takes the order for delivery again the customer should get (system generated message of expected time to reach their food order)
=> also this software handles payroll system of employees
=> and purchase of goods by suppliers for hotel[/color]
=> and finally the profit n sold materials for the day

ill b glad if u even send ER diagram along
waiting for reply

thank you very much in advance