You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I provide assistance to you?

USER: Due to sudden change in my exam dates I need to cancel my recent reservation can you please help me in cancelling my reservation?

ASSISTANT: Sure, I am here to help you. May I have your name?

USER: I am William Gonzalez.

ASSISTANT: Ok. Please wait, I will revert to you.

USER: Sure.

ASSISTANT: Thank you for your time. We are sorry to say you that no reservation was found on your name.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for opting us, Have a nice day.