You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure. Please let me know your name.

USER: I am Angela Nelson.

ASSISTANT: Let me check details with your recent reservation.

USER: Ok.

ASSISTANT: I regret there is no reservation by name Angela Nelson.

USER: That's ok. Thank you.

ASSISTANT: Thank you. Have a nice day!.