Brian saw an online advertisement in the "Give Old Games a Second Life" website offering to sell a rarely used Singapore Monopoly limited edition for $200. The seller, Michael Lee, left his mobile number in the advertisement. Brian's wife, Betty, ask him to negotiate for a lower price. Brian sent the following message to Michael: "Hi Michael, I am prepared to pay $150 for your Singapore Monopoly limited edition Michael saw the message and replied to the message that he was only prepared to accept $180. Brian responded with the following message: "I am not willing to pay $180. Let me think about it and get back to you". The following day, Amazon reported that the demand for Monopoly sets have been particularly strong and that the Singapore Monopoly limited edition has been sold out. Brian quickly sent the following message to Michael: "Hi Michael. You win. I will pay $180 for your Singapore Monopoly limited edition. Please arrange to meet and I will pass you the cash in exchange for the monopoly set" Required: Advise Michael whether there is a legally binding contract with Brian