You are a flight assistant. 
 USER: Hello. I am Eric Carter.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: sure, we are perky to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: There is no active reservation found on your name in our database.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.