# 2.4. Multi-turn Dialogue

All examples in the previous session are single-turn dialogues, where users get to interact with the system only once. Let us design a multi-turn dialogue:

{% code lineNumbers="true" %}

```python
transitions = {
    'state': 'start',
    '`Hello. How are you?`': {
        '[{good, fantastic}]': {
            '`Glad to hear that you are doing well :)`': {
                '[{how, and}, {you, going}]': {
                    '`I feel superb. Thank you!`': 'end'
                }
            }
        },
        'error': {
            '`Got it; thanks for sharing.`': 'end'
        },
    }
}
```

{% endcode %}

* `#5`: after the system says "*Glad to ...*", it matches the input with those conditions.
* `#6`: if the condition in `#5` is true, the system responds with "*I feel superb ..."*.

{% tabs %}
{% tab title="Output" %}

```
S: Hello. How are you?
U: Good!
S: Glad to hear that you are doing well :)
U: How are you doing?
S: I feel superb. Thank you!
```

{% endtab %}

{% tab title="Error" %}

```
S: Hello. How are you?
U: Fantastic
S: Glad to hear that you are doing well :)
U: Thank you!
Traceback (most recent call last):
...
```

{% endtab %}
{% endtabs %}

The condition in `#6` does not come with the default action indicated by an error transition. Let us create an error transition for it:

{% code lineNumbers="true" %}

```python
def multiturn_dialogue() -> DialogueFlow:
    transitions = {
        'state': 'start',
        '`Hello. How are you?`': {
            '[{good, fantastic}]': {
                '`Glad to hear that you are doing well :)`': {
                    '[{how, and}, {you, going}]': {
                        '`I feel superb. Thank you!`': 'end'
                    },
                    'error': {
                        '`You are the best!`': 'end'
                    }
                }
            },
            'error': {
                '`Got it; thanks for sharing.`': 'end'
            },
        }
    }

    df = DialogueFlow('start', end_state='end')
    df.load_transitions(transitions)
    return df


if __name__ == '__main__':
    multiturn_dialogue().run()
```

{% endcode %}

* `#10`: prompts the error statement for any other inputs.

{% tabs %}
{% tab title="Output" %}

```
S: Hello. How are you?
U: Fantastic!
S: Glad to hear that you are doing well :)
U: Thank you!
S: You are the best!
```

{% endtab %}
{% endtabs %}


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