You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Dorothy Smith. Unfortunately my exams was got cancelled so I want to cancel my reservation, can you please help me that?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your given name.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.