"Uber has actually been completing trips in your area for some time, but now we are giving you the attention you deserve."
Rideshare operations and taxis provide the same service, but taxi companies are regulated by local governments. Earlier this month, Seattle became the first city to regulate rideshare companies.
On Tuesday, an organization of taxicab drivers in Seattle and King County sued Uber.
Rides with a rideshare service are typically reserved through a smartphone app. A potential customer will check to see if a driver is available, and if so, a ride is arranged for a set price. Rideshare drivers use their personal vehicles to provide the service.