<category>
<pattern>Q3 income _</pattern>
<template><delay>2</delay>
<set name = "topic">Q4</set> I am from UK. May I know What your home town is. </template>
</category>
<topic name = "Q4">
<category>
<pattern>_</pattern>
<that>_ MAY I KNOW WHAT YOUR HOME TOWN IS</that>
<template><delay>1</delay><set name = "topic">Q5</set> Good to know.</template>
</category>
</topic>
The hometown question's answer can't be captured by topic Q4.