User : My best friend and his family are coming to visit and I want to take them out while they are here. Is there a concert playing next Friday? 
System : I can look into that but let’s narrow it down a bit first. What city or cities would you like me to search in?
Please generate a sentence between the previous user's and system's utterances that could be ascribed either to the user or the system but which adresses a new topic : Please answer in JSON format.
user