You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to cancel my reservation because I was having interview, but I am not fully prepared, can you please help me?

ASSISTANT: Sure, I will help you to cancel. May I know your name?

USER: Myself Margaret Smith.

ASSISTANT: Smith, there is no reservation found for you to cancel your reservation.

USER: Oh! that's fine. Thank you for the information.

ASSISTANT: Welcome. Thank you for choosing us.