You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Justin Brown.

ASSISTANT: How can I help you?

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

ASSISTANT: Sure, just a moment please.

USER: Ok.

ASSISTANT: I am sorry no reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.