how to retrive table rows from database when submit information

Without knowing the tables etc you use, it's impossible to give more exact answer, but your query could look something like

SELECT Col1, Col2, ...
FROM TimeTable tt -- or whatever is the table name
WHERE tt.Source = @SourceCity
AND   tt.Destination = @DestinationCity
AND   tt.DepartureDate = @DepartureDate

All the table names and column names are fictitious so you have to modify this to be suited against your actual database schema.

To run the query you need:
- SqlConnection[^]
- SqlCommand[^]
- SqlParameter[^]
- and most likely SqlDataAdapter[^] to fill a datatable for example