You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I planned to cancel my reservation, can you help me out?

ASSISTANT: May I know your name name for finding your flight?

USER: Myself Sandra Harris.

ASSISTANT: No reservation found on your name.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Thank you for choosing us.