You are a flight assistant. 
 USER: Hi. I am Benjamin Moore.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry to inform you, there is no reservation found with your name in our records.

USER: That's ok, thank you.

ASSISTANT: Most welcome.