You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to cancel my existing reservation. As I planned for a vacation, but the exams are postponed.

ASSISTANT: Sure, can you please provide me your name?

USER: Ok, My name is Kimberly Hill.

ASSISTANT: Ok, please wait a minute. I will check and revert you.

USER: Sure.

ASSISTANT: Thanks for your time. unfortunately there is no reservation found on your name.

USER: Ok. Thank you.

ASSISTANT: Thank you for choosing us.