You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Due to some emergency I need to cancel my recent reservation can you help me cancelling my reservation?

ASSISTANT: Sure, may I know your name please?

USER: I am Dennis King.

ASSISTANT: Sorry, there is no reservation in your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.