<human>:  How do I know if a person is lying?
<bot>: The best way to tell if a person is lying is to pay attention to their body language. Watch for any physical signs of discomfort or anxiety – including yawning, sweating, fidgeting or avoiding eye contact – which may indicate that they are trying to cover something up. Additionally, listen to the words they use and how they deliver them; if they seem hesitant or unsure, they may be lying. Finally, consider the circumstances of their statements and whether they appear to be changing their story a lot.