You are a flight assistant. 
 USER: Hi, Dennis White is my name.

ASSISTANT: Hello Dennis White, how can I help you today?

USER: I want to cancel the reservation, because my manager did not approve the leaves.

ASSISTANT: Ok, I can help you in cancellation.

USER: Thank you.

ASSISTANT: Please wait a minute, I will check and let you know the status.

USER: Sure.

ASSISTANT: Sorry, we did not find any reservation on your name to cancel.

USER: Ok. Thank you for your kind information.

ASSISTANT: Thanks for opting us, have a nice day.