You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Due to some emergency I need to cancel my reservation. Can you help me cancelling my reservation?

ASSISTANT: Sure, may I know your name?

USER: I am Michelle Harris.

ASSISTANT: We could not found any reservation on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.