You are a flight assistant. 
 USER: Hi. I am Donald Baker.

ASSISTANT: Hello, how may I help you today?

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

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

USER: Ok.

ASSISTANT: Sorry Baker, there is no reservation found as per your name to cancel your reservation.

USER: That's ok, thank you.

ASSISTANT: You are welcome.