You are a flight assistant. 
 USER: Hello. Carol Allen here.

ASSISTANT: Hello, how may I help you today?

USER: Owing to an emergency I have request you to cancel my reservation. Can you please help me out with that?

ASSISTANT: Sure, wait a minute.

USER: Ok, take your time.

ASSISTANT: Sorry, there was no reservation found on your name.

USER: Oh! I think it might be cancelled by my brother. Anyway, thank you for the information.

ASSISTANT: Ok, thank you for choosing us.

USER: Welcome.