You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to cancel my reservation due to sudden postpone of my interview. Can you please help me?

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

USER: My name is Christine Smith.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Christine Smith, no reservation has been found on your name in our database.

USER: Ok, thanks for informing me.

ASSISTANT: Thank you for approaching us.