You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to cancel recent reservation due to sudden postpone of my exams dates.

ASSISTANT: Ok.

USER: Can you help me in doing that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Sure, I am Jeffrey Johnson.

ASSISTANT: Sorry there is no active reservation on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you.