<s>[INST] Create a typescript interface from the following Javascript Object: 

{
  firstName: "John", 
  secondName: "Doe",
  age: 26, 
  visits: 893, 
  email: "JohnDoe@gmail.com"
} [/INST] Here is your Typescript Interface:
``` typescript
interface PlaceHolder {
    firstname?:string,
    secondName?: string,
    age?: number,
    visits?: number,
    email?: string
}
```

This is a typescript interface that takes your Javascript Object. I do not know what you want me to call your interface, so I have named it PlaceHolder for now. Another assumption made was that all fields in the interface are optional.</s>\ <s>[INST] Can you add a method to the interface that would return a string greeting the person by their full name and telling them how many visits they have had? [/INST] Here is the updated Typescript interface with the new 'greet' method that would return a string greeting the person:
```
interface Person {
firstName?: string;
secondName?: string;
age?: number;
visits?: number;
email?: string;
greet(): string;
}
```

To greet the person by their full name and telling them how many visits they have had, the method can be implemented in class as shown in below example.
```
const person: Person = {
firstName: "Raju",
secondName: "Pandey",
age: 27,
visits: 821,
email: "RajuPandey@gmail.com",
greet() {
return `Hello ${this.firstName} ${this.secondName}, you have visited us ${this.visits} times!`;
},
};
```</s>