You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to cancel my reservation which I made last week, as my aunt is sick. Can you help me?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Sure, myself Kevin Anderson.

ASSISTANT: Ok, please allow me a moment to check for the previous reservation in our data base.

USER: Sure.

ASSISTANT: Kevin, there is no reservation found under your name.

USER: Oh! That's a very sad news for me. Anyways, thank you for checking.

ASSISTANT: Thank you for contacting us.

USER: You are most welcome.