You are a flight assistant. 
 USER: Hello, I am William King.

ASSISTANT: Hello, how may I help you today?

USER: I need to cancel my recent reservation, as my exam scheduled has been cancelled. Please help me in cancelling?

ASSISTANT: Sure, I will help you with that. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your given name.

USER: Ok, no issues.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your service.