Would like an opinion!! Be nice, I am a beginner!

Question

if someone is bored, would you mind compiling / running this program and let me know where I could improve.
also, towards the end only the characters Y + N should be accepted. any ideas how to incorporate this.
class assign1{
          public static void main(String[]args){
          char surname;
          char film;
          char again;
          int people;
          double cost;
          do
               System.out.println("Please enter your surname\n\n");
               Keyboard.skipLine();
               surname = Keyboard.readChar();
               System.out.println("What film would you like to see?\n\n");
               Keyboard.skipLine();
               film = Keyboard.readChar();
               do
                    System.out.println("How many people are in your party?\n\n");
                    Keyboard.skipLine();
                    people = Keyboard.readInt();
                    if (people >10)
                         System.out.println("Sorry the maximum tickets you can purchase is 10\n");
                         System.out.println("Please try again");
                    else
                         System.out.println ("Thank you here are your ticket details\n\n");
               }while (people >= 10);
                    if (people > 6)
                         cost = (people * 4 * 0.90);
                         System.out.println("Film:" + film);
                         System.out.println("Surname:" + surname);
                         System.out.println("No in Party:" + people);
                         System.out.println("Cost:" + cost);
                    else
                         cost = (people * 4);
                         System.out.println("Film:" + film);
                         System.out.println("Surname:" + surname);
                         System.out.println("No in Party:" + people);
                         System.out.println("Cost:" + cost);
                         System.out.println("Process Another Ticket 'Y' / 'N'");
                         again = Keyboard.readChar();
          }while (again == 'y');
}

Answer 1

java naming conventions
class assign1{usually init but optional
          char surname;
          char film;
          char again;
          int people;
          double cost;
nested do/while cumbersome (for me)
          do
               do
               {do away with 'again', ie while( 'y' == Keyboard.readChar() )
                         again = Keyboard.readChar();
          }while (again == 'y');and always block code, ie use '{' and '}'