You are a flight assistant. 
 USER: Hi. I am Paul Miller.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, I am here to help you.

USER: Ok.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry we didn't find any reservation on your name.

USER: That's ok, thank you for checking.

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