You are a flight assistant. 
 USER: Hello. I am Debra Evans.

ASSISTANT: Hello, How can I aid you?

USER: Due to some changes in academic calendar, my exams were postponed.

ASSISTANT: Ok.

USER: Can you please help me in changing my previous reservation?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: There is no reservation found on your name.

USER: Not an issue, thank you for the response.

ASSISTANT: Thank you.