You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist 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: Thank you. I am Anna Williams.

ASSISTANT: There is no reservation found under your name.

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

ASSISTANT: Thank you for choosing us.