You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Katherine Thompson. Can you help me changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure Katherine, I am happy to help you with that.

USER: Ok.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Sure.

ASSISTANT: Sorry Katherine Thompson, no reservation has found under your name to change.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us, have a good day.