You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I am Kevin Hall. Can you help me in changing my reservation, as my exam is postponed?

ASSISTANT: Sure, I am here to help you out. Please allow me a moment.

USER: Ok.

ASSISTANT: Sorry  Kevin Hall, there is no reservation found on your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.