You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I abet you today?

USER: I am Carol Jones. I want to change my reservation due to postpone of my exams.

ASSISTANT: sure, I will help you.

USER: Thank you.

ASSISTANT: Sorry Carol, no reservation found on your name in our database.

USER: Ok, thank you for information.

ASSISTANT: Thank you for reaching us.