You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER:  I am Cynthia Hill. I want to cancel my reservation due to prepone of my exam.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Thank you for your help.

ASSISTANT: Thanks for reaching us, have a good day.