You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, may I know your name?

USER: I am Samuel Scott.

ASSISTANT: Ok, please wait for sometime.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry as per your concern I can not change your reservation because there is no reservation found on your name.

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

ASSISTANT: Thank you for reaching us.