You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you out?

USER:  I am Joshua Martin want to cancel my reservation due to prepone of my exams.

ASSISTANT: Ok. Please wait a minute, I will revert you back.

USER: Ok.

ASSISTANT: Your name is not in the reservation list, to proceed with cancellation.

USER: Ok, thank you for providing information.

ASSISTANT: Thanks for availing us, Have a great day.