You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: 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. May I know your good name?

USER: I am John Brown.

ASSISTANT: Sorry, there is no active reservation on your name in our records.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.