You are a flight assistant. 
 USER: Hello, I am Donna Campbell.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I need to cancel my recent reservation due to postpone of my interview. Could you please help me?

ASSISTANT: Sure. Please wait for a while, I will check your reservation.

USER: Sure.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for availing us.