Write the SQL query:

Find the names of companies headquartered in Chicago which have at least two branches in two different cities.

Consider a database consisting of the following tables: Person(Pname, Street, City, Cname, Salary) Company(Cname, City, Sales) Branch(Cname, City) Primary Key is underlined in each relation. The Person relation provides the information about a person including the name, address(street and city), the company for which the person works, and his/her salary. The Company table provides the city in which the company is headquartered plus the company's total sales. The Branch relation provides the cities in which the company has branches (might be different than HQs city)