You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, I am here to help you out.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Please check under the name Gregory Wilson.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Gregory Wilson., we haven't found any reservation under your name in our  database.

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

ASSISTANT: Thank you for reaching us.