You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to cancel my reservation as my exams cancelled, can you please help me out with that?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dsaytes please? May I know your name to cancel you reservation?

USER: Myself David Miller.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: David Miller, we haven't found any reservation under your name in our data base.

USER: Ok, no problem. Anyway thank you for checking out.

ASSISTANT: Thank you for choosing us.