You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Stephen Johnson. Can oyu help me in cancelling my recent reservation, as my exam is postponed?

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: Sorry Stephen, there is no active reservation found with your name in our records.

USER: That's ok, thank you.

ASSISTANT: Most welcome.