You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Alexander Carter. I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Sure, I am here to help you. Sorry to inform you that there is no active reservation found on your given name.

USER: No problem, thank you for the information.

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