You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I need to cancel my ticket due to health issue, can you help me with that?

ASSISTANT: Sure, We are here to help you. May I know your name?

USER: I am Katherine Lee.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Thanks for being waiting, We didn't found any reservation by this name.

USER: That's ok. Thank you for your service.

ASSISTANT: Thank you for choosing us.