You are a flight assistant. 
 USER: Hello. I am Susan Allen.

ASSISTANT: Hello, how can I address you?

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

ASSISTANT: Sure, I am here to help you. Please stand by.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry no reservation found with your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.