You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I want to cancel recent reservation due to sudden postpone of my exams. Can you help me with that?

ASSISTANT: Sure, Please wait a second.

USER: Ok.

ASSISTANT: May I know your name?

USER: I am Karen Phillips.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you for availing us.