You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when did cash cab go off the air?" whose answer is April 18, 2012.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did cash cab go off the air
Useful Output:

Doc 1: What It's Really Like to Ride in the Cash Cab. The game show is back after five years off the air, and we took it for a spin. Headshot of
Doc 2: The show, which originated in the U.K. in 2005 and has aired in dozens of countries, has been off the air in the U.S. since 2012, when Discovery
Doc 3: From the time it began I figured that it was at least mildly successful so I was curious to hear why it was cancelled or at least what its reception was.
Doc 4: “Cash Cab” was recently revived at Discovery in 2017, with an added twist — cab riders would be ambushed by “America's favorite celebrities.” It
Doc 5: The original Cash Cab aired on Discovery from 2008 to 2015, and amassed a dedicated cult following for its wry host and easygoing energy. Of