You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Charles Robinson. Can you help me in cancelling my recent reservation, as my exam is postponed?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.