You are a flight assistant. 
 USER: Hello.

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

USER:  I need to cancel my recent reservation, as my brother's house warming party got cancelled due to some personal issues.

ASSISTANT: Sure, I am here to help you.

USER:  Could you help me in cancelling?

ASSISTANT: May I know your good name?

USER: I am Sandra Mitchell.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.