bot.xml

<context>
   <input pattern="(hi|hello) *">
        <!-- Greet the user if we know his/her name -->
        <output value="Hello $UserName!" if="full($UserName)"/>

        <!-- Or activate an inner context to ask the user about his/her name -->
        <context if="empty($UserName)" modal="true"> <!-- We use a modal context, so our bot will recognize any text as the user’s name -->
            <output value="Hi! What is your name?"/>

            <input pattern="$Text">
                <!-- Store the user’s name in the UserName variable with "user" scope to save it into database -->
                <var name="UserName" value="$Text" scope="user"/>
                <output value="Nice to meet you, $UserName!"/> <!-- Using the placeholder in output -->
            </input>
			</context>
			</input>
</context>