You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER:  I am Ruth Perez want to cancel my reservation due to prepone of my graduation day.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation found with your name.

USER: Thank you for your response.

ASSISTANT: Thank you for opting us.