You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Due to some problems my trip was cancelled so can you please cancel my flight ticket?

ASSISTANT: Sure, may I know your name?

USER: Thank you for your response, my name is Angela Nelson.

ASSISTANT: Please, wait a minute.

USER: Ok.

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

USER: Oh! It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.