You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be at your service today?

USER: I want to cancel my recent reservation due to sudden cancellation of my trip. Can you help me?

ASSISTANT: May I know your name please?

USER: Karen Anderson here.

ASSISTANT: I am sorry no reservation found on your name.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for choosing us.