You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Brenda Hernandez. Can you help me in cancelling my previous reservation?

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Sorry, there is no reservation with your name to cancel further.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you.