Billy is keen to start his own business selling frozen pizza on-line using the internet.

Bob is going to hold a party soon.He sees the advertisement and is keen to buy the frozen pizza.Bob goes on-line to Billy's website.However, he is unable to click on the 'place order' icon.There is a phone number displayed on website with a statement inviting customers to place orders through the means of sms text message.

Accordingly, Bob places the order for 20 packets of the frozen pizzas via sms text message and sends the text message to Billy.

Unfortunately, Billy is away in Malaysia and his handphone does not have an auto roaming facility.As a result, he does not receive the sms text message sent by Bob.

As Billy did not receive the sms text message from Bob, he fails to make the delivery.Bob waits till the night of his party and is angry at the non-delivery.He calls Billy and threatens to sue him.

Please analyse the case.