Agency accounts always "fish" for sales. They usually, at least daily, ask a random question to spark a conversation/sale. Not sure if this specific account/creator is currently doing it but many do. Recently, they do this multiple times a day and if you don't see it (or respond) they delete it so it doesn't look like they are stalking you. That's why you see you have a new message in the notifications bar but when you open up the chat, there's no new conversation. They delete the random post but the notification stays.