You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Hernandez.

ASSISTANT: How can I help you Mary?

USER: I am planning to cancel my previous reservation, can you help me?

ASSISTANT: Please wait, I will get back to you.

USER: Ok.

ASSISTANT: Sorry Mary, no reservation found on your name in our database.

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

ASSISTANT: My pleasure, have a great day.