You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Dorothy Young. I am planning to cancel my recent reservation, due to health issue. Can you please cancel my ticket?

ASSISTANT: Sure, wait a minute.

USER: Sure.

ASSISTANT: We cancelled your reservation successfully.

USER: Thank you for your service.

ASSISTANT: Thank you for opting us.