Please help me with approximately 300 words with an introduction and conclusion of about 150 words each.

- Altair Rigel wants to surprise his wife Bella for their 30th wedding anniversary so visits a local jewellery shop in Hobart. The owner of the jewellery business is Formalhaut who knows Altair quite well, having taken a number of Beacon Tours over the past few years. Over the phone Altair confirms with Formalhaut that he wants a necklace made for his wife from red beryl and white gold. A design is agreed and so is the price of $3 000. The pendant is to ready for collection by the day before Bella's birthday on the 10th November. Altair pays a $1,000 deposit and agrees to return on the 9th November to collect the pendant. Over the next few days Altair proudly tells a few friends that he is having a special pendant made by Formalhaut for his wife. He tells a number of his friends over a luncheon one day and this is overheard by some local villains. On the 9th November one of these villains attends Fomalhaut's jewellery shop claiming to be Altair. He confirms he is there to pick up the pendant for Bella. Unfortunately, that day Formalhaut is away so he has left his new shop assistant Sirius in charge. Sirius has never seen Altair but was aware that he would be coming in to collect the pendant. Sirius hands the pendant over to the villain. Later that day when Altair attends the jewellery shop the error is discovered. Required: Advise Altair and Formalhaut if the legal principles in relation to mistake as to identity is relevant here and who, if any does it assist? Also, applying its principle what might be the expected outcome and is this a fair result