[Yashas]

I have a suggestion, this won't fix the problem

Код:

if(IsPlayerConnected(playerid))

The dialog is not shown because ShowPlayerDialog was never called.It could be because one of your ifs turned out to be false or the function execution failed due to some run-time error.

Replace your code with this and tell me what all were printed in the server window.
http://pastebin.com/xEtrPGL2