You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I would like to cancel my recent reservation because my health condition was not good, can you help me?

ASSISTANT: Please let me know your name?

USER: Katherine Roberts here.

ASSISTANT: Ok. Sorry, there is no reservation by name Katherine Roberts.

USER: No problem, thanks for the information.

ASSISTANT: Thank you. Have a nice day ahead!.