So what should it return?
http://www.sqlservercentral.com/articles/Best+Practices/61537/
p.s. Hotel booking systems are often used as exercises for database courses because they're very hard to get right.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability