You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Joshua Clark. I want to cancel my reservation, due to my personal problems. Could you help me in cancellation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: Not an issue. Thank you for your service.

ASSISTANT: Thank you for opting us.