Decently call the attendant and quietly tell her that you wish to pay. If no one comes for a long time, address a passing waitress or waiter and say, "May I please pay." If you have been waiting for an unreasonable amount of time and are unable to summon anyone using the above methods, get up and go to the bar to pay. On a date or business meeting, arrange to pay off the table. This will avoid any awkwardness at the table if there is a discrepancy in the bill and guests won't know the total amount.
If you're happy with the service, tip the server. In the Czech Republic, it is customary to leave a tip of around 10% of the total spend.
In a restaurant, the man should always pay. On a date, a couple can arrange for the woman to buy, say, theatre or exhibition tickets and the man to pay for dinner. In a business meeting, the one who invites pays. If it is the woman, she can tell the attendant in advance or ask for the bill.