Book tickets

#### User Story:
> User can book ticket.

#### Pre-requisites:
- [ ] Create Ticket table
- [ ] Ticket model
- [ ] Ticket DAO (create)
- [ ] Ticket Service (create)

#### Validation:
- [ ] Form Validation:

- User ID ( <= 0)
- Number of Adults ( <= 0 )
- Number of Children ( < 0 )
- From Date (null or empty , Pattern, valid range)
- To Date (null or empty , Pattern, valid range)

- [ ] Business Validation:
- Check If the user is already exists in user table.

#### Messages:

- User Id cannot be less than zero.
- Number of adults is greater than 0.
- Number of children is greater than or equal to 0.
- From date is not null or empty or invalid pattern.
- To date is not null or empty or invalid pattern.
- User doesn't exist.

#### Flow:
```mermaid
graph TD;
A(Value Passed to TicketService - Ticket object) --> B(Form Validation) -- Valid --> C(Business Validation)
B --Invalid --> H(Validation Exception)
C -- Valid--> D(Value Passed to TicketDAO)
D --> E(Value Stored in Database)
C -- Invalid --> F(Validation Exception)
```

Inizia dal modello Ticket e da TicketService, quindi segui il Ticket DAO e la creazione delle tabelle descritta nei prerequisiti. Implementa il flusso di prenotazione con le validazioni indicate del modulo e dell’esistenza dell’utente, persisti i ticket validi e restituisci i messaggi di validazione specificati.

Scritto dal modello di indicizzazione a partire dal testo della issue.