Which SP of SQL Server 2012 did you use ? 
This is known [issue][1] with SQL Server 2012 SP2


The information for "Restore to:" is empty which was supposed to show the timelines.
To work around this issue:

1) Use SQL 2014 SSMS 

2) [Use T-SQL][2]


  [1]: http://%20https://support.microsoft.com/en-us/kb/3065060
  [2]: http://solutioncenter.apexsql.com/reverting-your-sql-server-database-back-to-a-specific-point-in-time/