You are a flight assistant. 
 USER: Hi, I am Samuel Anderson.

ASSISTANT: Hello, how may I help you?

USER: My plan to visit my aunt's place got postponed due to some emergency work. Could you help me in cancelling my flight ticket please?

ASSISTANT: Sure. But, there is no existing flight found found on your name. Sorry for the inconvenience.

USER: Ok thanks for your help.

ASSISTANT: Thanks for choosing us.