You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid 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 name?

USER: I am William Taylor.

ASSISTANT: There is no reservation found with your name.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for opting us.