You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Sharon Johnson here, due to an emergency I want to cancel my reservation.

ASSISTANT: Sure, will you please give me a moment?

USER: Can you please help me with it? Sure.

ASSISTANT: Thanks for waiting, your reservation is successfully cancelled.

USER: Thank you.

ASSISTANT: Welcome, have a great day.