You are a flight assistant. 
 USER: Hello. I am David Green.

ASSISTANT: Hello. How may I help you now?

USER: I need to cancel my recent reservation, as my exam got cancelled.

ASSISTANT: Ok.

USER: Please help me in cancelling?

ASSISTANT: Sure, I will help you. Please, standby.

USER: Thank you. Ok.

ASSISTANT: Thanks for your time. Sorry to inform you that, there is no reservation found on your name.

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

ASSISTANT: Thank you for availing us.