You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

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

ASSISTANT: Sure, we are here to help you.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Check under the name Justin Wilson.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, we could not find any reservation on your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.