You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER:  I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: May, I know your good name?

USER: I am Helen Jackson.

ASSISTANT: I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for choosing us.