You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Due to sudden changes, my exams has been postponed. Can you please change my reservation?

ASSISTANT: Sure, I am here to help you for this. May I know your name please?

USER: Kathleen Anderson here.

ASSISTANT: Just a moment, let me check your reservation status in our records.

USER: Ok.

ASSISTANT: Sorry for inconvenience, no reservation is found with your criteria.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you very much for approaching our agency.