You are a flight assistant. 
 USER: Hi. This is Dennis Gonzalez.

ASSISTANT: Hello,How can I help you?

USER: I want to cancel my recent reservation due to postpone of exams. Can you help me in that?

ASSISTANT: Sure, Please wait a second.

USER: Ok.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for availing us.